Payment of drydocking costs Expenditures For Dry Docking Expenditures For Dry Docking Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Number of vessels to be sold Number Of Vessels To Be Sold Number Of Vessels To Be Sold Vessels disposal Vessel’s disposal Vessel’s disposal Subsequent Event Subsequent Event [Member] Voyage Charters Voyage Charters [Member] Voyage charters. Document Fiscal Year Focus Document Fiscal Year Focus Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Additions to vessels under construction Construction In Progress, Payment Construction In Progress, Payment Vessels, net Vessels In Operation [Member] Vessels In Operation [Member] Break option period Sale Leaseback Transaction, Break Option, Period Sale Leaseback Transaction, Break Option, Period Common stock—$0.01 par value per share; 400,000,000 shares authorized; 61,493,127 shares issued and outstanding at June 30, 2026 (December 31, 2025: 65,250,444) Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Line of Credit Line of Credit [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] June 2026 Pre-Delivery Secured Term Loan June 2026 Pre-Delivery Secured Term Loan [Member] June 2026 Pre-Delivery Secured Term Loan Amendment Flag Amendment Flag Consolidated Entities [Axis] Consolidated Entities [Axis] Current liabilities Current Liabilities Liabilities, Current [Abstract] Assets held for sale Assets Held For Sale [Text Block] Assets Held For Sale December 2022 Secured Term Loan and Revolving Credit Facility December 2022 Secured Term Loan And Revolving Credit Facility [Member] December 2022 Secured Term Loan And Revolving Credit Facility Number of defendants Loss Contingency, Number of Defendants Vessels Vessels [Member] Vessels Loss Contingencies [Table] Loss Contingencies [Table] Number of vessels released Number Of Vessels Released Number Of Vessels Released Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Number of vessels contracted Number of Vessels Contracted Number of Vessels Contracted Total non-current liabilities Liabilities, Noncurrent Consolidated Entities [Domain] Consolidated Entities [Domain] Related Party Transactions Related Party Transactions Disclosure [Text Block] 2030 Other Commitment, to be Paid, Year Four DB Credit Facility B Credit Facility B [Member] DB credit facility b. Property, Plant, and Equipment [Abstract] Foreign currency translation gain/(loss) Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Cash and Cash Equivalents [Abstract] Non-current liabilities Non-Current Liabilities Liabilities, Noncurrent [Abstract] Earnings per share attributable to stockholders of Navigator Holdings Ltd.: Earnings Per Share Attributable To Stockholders, Basic And Diluted [Abstract] Earnings Per Share Attributable To Stockholders, Basic And Diluted Hedged notional amount Derivative, Notional Amount Basic (in shares) Basic weighted average number of shares (in shares) Weighted Average Number of Shares Outstanding, Basic Senior Unsecured Bonds Senior Unsecured Bonds [Member] Senior Unsecured Bonds Accrued income Contract with Customer, Asset, after Allowance for Credit Loss, Current JOLCO, Break Option One JOLCO, Break Option One [Member] JOLCO, Break Option One Loss Contingencies [Line Items] Loss Contingencies [Line Items] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Total current liabilities Liabilities, Current 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Derivative liability Derivative Liability, Current Equity method investments – additions Equity Method Investment Additions Equity method investment additions. Operating lease, monthly gross rent Operating Leases, Monthly Contractual Gross Rent Operating Leases, Monthly Contractual Gross Rent Concentration Risk [Table] Concentration Risk [Table] Operating revenues Operating revenues - charters Revenue from Contract with Customer, Including Assessed Tax Dividend and share repurchases, as a percentage of net income Dividend And Share Repurchases, As A Percentage Of Net Income Dividend And Share Repurchases, As A Percentage Of Net Income Derivative, net Asset (liability) Derivative, Fair Value, Net Net expenses Related Party Transactions Net Income (Expense) Related party transactions net income expense. Statement of Financial Position [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Senior unsecured bond, net of deferred financing costs Unsecured Long-Term Debt, Noncurrent Intangible assets, net of accumulated amortization Intangible Asset, Finite-Lived, after Accumulated Amortization Distributions from equity method investments Proceeds from Equity Method Investment, Distribution, Return of Capital Debt instrument, number of tranches Debt Instrument, Number Of Tranches Debt Instrument, Number Of Tranches Movement In Vessels Under Construction [Roll Forward] Movement In Vessels Under Construction [Roll Forward] Movement In Vessels Under Construction Level 2 Fair Value, Inputs, Level 2 [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Insurance recoveries Proceeds from Insurance Settlement, Investing Activities Current portion of secured term loan facilities, net of deferred financing costs Current portion of secured term loan facilities and revolving credit facilities, net of deferred financing costs Long-Term Debt, Current Maturities LPG Carriers LPG Carriers [Member] LPG Carriers Subsequent Event Type [Axis] Subsequent Event Type [Axis] Restricted shares issued (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Contractual Obligation Fiscal Year Maturity [Line Items] Contractual Obligation Fiscal Year Maturity [Line Items] Contractual Obligation Fiscal Year Maturity [Line Items] Debt term extension Debt Instrument, Term, Extension Period Debt Instrument, Term, Extension Period Average shipyard price per vessel to be delivered (in usd per vessel) Average Shipyard Price Per Vessel To Be Delivered Average Shipyard Price Per Vessel To Be Delivered Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] May 2025 Senior Secured Term Loan and RCF May 2025 Senior Secured Term Loan and RCF [Member] May 2025 Senior Secured Term Loan and RCF Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Gain from sale Gain (Loss) on Disposition of Property Plant Equipment Non-Controlling Interest Noncontrolling Interest [Member] Amortization of deferred financing costs Amortization of Debt Issuance Costs Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Unsecured Debt Unsecured Debt [Member] Write-offs of fully depreciated assets Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization, Disposition Total Outstanding balance Long-Term Debt In the second year Revenue Receivable Due In Year Two Revenue receivable due in year two. Vessels Property, Plant, and Equipment [Text Block] Document Period End Date Document Period End Date Changes in operating assets and liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Sale Leaseback Transaction, Name [Domain] Sale Leaseback Transaction, Name [Domain] Net cash (used in)/provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate principal amount Debt Instrument, Face Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Time Charter Agreements Time Charter Agreements [Member] Time charter agreements. Debt term Debt Instrument, Term Total Revenue Receivable Due Revenue Receivable Due Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Costs amortized Equity Method Investment, Other-than-Temporary Impairment Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Number of vessels to build Number Of Vessels To Build Number Of Vessels To Build Current portion of operating lease liabilities Operating Lease, Liability, Current Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Accrued interest Interest Payable, Current Schedule of Vessels Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Earnings per Share Earnings Per Share [Text Block] Earnings per share attributable to stockholders of Navigator Holdings Ltd.: Earnings Per Share [Abstract] Contractual Obligation Fiscal Year Maturity [Table] Contractual Obligation Fiscal Year Maturity [Table] Contractual Obligation Fiscal Year Maturity [Table] Time Charters, Expiring Within Three Years Time Charters, Expiring Within Three Years [Member] Time Charters, Expiring Within Three Years Schedule of Weighted Average Shares Outstanding Schedule of Weighted Average Number of Shares [Table Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Total liabilities Total liabilities Liabilities Geographical [Domain] Geographical [Domain] Additions to vessels and equipment Payments to Acquire Property, Plant, and Equipment Dividend paid to non-controlling interest Payments of Ordinary Dividends, Noncontrolling Interest Derivative interest rate Fixed rate Derivative, Fixed Interest Rate Time Charters, Expiring Within One Year Time Charters, Expiring Within One Year [Member] Time Charters, Expiring Within One Year Concentration Risk [Line Items] Concentration Risk [Line Items] Unrealized (loss)/gain on non-designated derivative instruments Unrealized loss/(gain) on non-designated derivative instruments Unrealized Gain (Loss) on Derivatives Subsidiary ownership percentage by parent Subsidiary, Ownership Percentage, Parent Gross debt Carrying Amount (Liability) Long-Term Debt, Gross Credit Facility [Domain] Credit Facility [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Number of operated vessels, excluding Unigas Pool Number Of Vessels In Fleet, Excluding Independently Managed Number Of Vessels In Fleet, Excluding Independently Managed Schedule of Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalent, and Investment [Table Text Block] Related Party Transactions [Abstract] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Houston Houston [Member] Houston Voyage expenses Voyage Expenses Voyage Expenses Amounts due from related parties Other Receivables, Net, Current Accumulated Depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization [Abstract] Brokerage commission Sales Commissions and Fees Secured term loan facilities and revolving credit facilities net of current portion Long Term Debt Gross Non Current Long-term debt gross non-current. Voting interest acquired (as a percent) Business Combination, Voting Equity Interest Acquired, Percentage Diluted (in shares) Diluted weighted average number of shares (in shares) Weighted Average Number of Shares Outstanding, Diluted June 2026 JOLCO Financing June 2026 JOLCO Financing [Member] June 2026 JOLCO Financing Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Lease quarterly payment Sale Leaseback Transaction, Periodic Payment Sale Leaseback Transaction, Periodic Payment Schedule Of Description Of Business [Table] Schedule Of Description Of Business [Table] Schedule Of Description Of Business [Table] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Transfer to assets held for sale Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization, Reclassification, Decrease Thereafter Revenue Receivable Due In After Year Four Revenue Receivable Due In After Year Four Amon Gas Amon Gas [Member] Amon Gas Derivative Instruments Accounted for at Fair Value Derivative Instruments and Hedging Activities Disclosure [Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Custodial sentence, period Loss Contingency, Custodial Sentence, Period Loss Contingency, Custodial Sentence, Period Amon Joint Venture Amon Joint Venture [Member] Amon Joint Venture Revenue from Contract with Customer [Abstract] Unigas Pool Unigas Pool [Member] Unigas pool. Effect of dilutive potential share options (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Schedule of Assets Held-for-Sale Long-Lived Asset, Held-for-Sale [Table Text Block] Repayments under operating lease obligations Operating Lease, Payments Restricted cash Restricted Cash, Current Total comprehensive income attributable to: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Share-based compensation plan APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Dan Unity CO2 A/S ("Dan Unity") Dan Unity COTwo A S [Member] Dan Unity COTwo A S Schedules of Cash Flows for Committed Time Charter Revenues Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Proceeds of unsecured bonds Proceeds from Issuance of Unsecured Debt Derivative assets Derivative Asset, Noncurrent Organization, Consolidation and Presentation of Financial Statements [Abstract] Investment in preferred securities Payments to Acquire Trust Preferred Investments Total Lessee, Operating Lease, Liability, to be Paid Ammonia Carriers Ammonia Carriers [Member] Ammonia Carriers Repurchase of share capital Repurchase Of Share Capital Repurchase Of Share Capital Repurchase of common stock Stock Repurchased and Retired During Period, Value Repayment of secured term loan facilities and revolving credit facilities Repayment of lines of credit Repayments of Long-Term Lines of Credit Fair Value (Liability) Long-Term Debt, Fair Value Scenario [Domain] Scenario [Domain] Deferred tax liabilities Deferred Tax and Other Liabilities, Noncurrent Ethylene Ethylene [Member] Ethylene. Schedule of Due from Related Parties Schedule of Related Party Transaction Due From Related Party [Table Text Block] Schedule of related party transaction due from related party . Right-of-use asset Operating Lease, Right-of-Use Asset 2030 Contractual Obligation, to be Paid, Year Four Less: current portion of deferred financing costs Debt Issuance Costs, Current, Net Fair Value Disclosures [Abstract] March 2025 Bond Tap Issue Addendum March 2025 Bond Tap issuance March 2025 Bond Tap Issue Addendum [Member] March 2025 Bond Tap Issue Addendum In the third year Revenue Receivable Due In Year Three Revenue receivable due in year three. Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum Minimum [Member] Long-Term Line of Credit Long-Term Line of Credit Additions to vessels under construction Payments For Vessels Under Construction Payments For Vessels Under Construction Dividends paid Payments of Ordinary Dividends, Common Stock 2030 Long-Term Debt, Maturity, Year Four August 2024 Senior Secured Term Loan and Revolving Credit Facility August 2024 Senior Secured Term Loan And Revolving Credit Facility [Member] August 2024 Senior Secured Term Loan And Revolving Credit Facility Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Weighted average number of shares outstanding in the period: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Accrued income Unbilled Receivables, Current Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Estimate of possible loss Loss Contingency, Estimate of Possible Loss Dividend Dividends, Common Stock Derivative [Table] Derivative [Table] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Time Charters, Expiring Within Six Years Time Charters, Expiring Within Six Years [Member] Time Charters, Expiring Within Six Years Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Bullet payment Debt Instrument, Lump Sum Payment Debt Instrument, Lump Sum Payment BNP Paribas S.A. [Member] BNP Paribas S.A. [Member] BNP Paribas S.A. [Member] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Interest Rate Swap Interest Rate Swap [Member] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Bunkers and other inventory Inventory, Net of Allowances, Customer Advances and Progress Billings Lender Name [Axis] Lender Name [Axis] Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Income before taxes and share of result of equity method investments Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Secured Term Loan Facilities and Revolving Credit Facilities Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Total Contractual Obligation Schedule of Contractual Obligations Contractual Obligation, Fiscal Year Maturity [Table Text Block] Less deferred financing costs Debt Issuance Costs, Net In the fourth year Revenue Receivable Due In Year Four Revenue receivable due in year four. 2029 Other Commitment, to be Paid, Year Three Ultranav International ApS Naviera Ultranav Limitada [Member] Naviera ultranav limitada. Equity method investments Equity method investments at January 1, 2025 and 2026 Equity method investments at December 31, 2025 and June 30, 2026 Equity Method Investments Equity Component [Domain] Equity Component [Domain] Contributions to equity method investments Payments to Acquire Equity Method Investments Dividends declared Dividends, Common Stock, Cash Counterparty Name [Domain] Counterparty Name [Domain] Interest rate on bond Debt Instrument, Interest Rate, Stated Percentage Total Navigator Holdings Ltd. Stockholders’ Equity Equity, Attributable to Parent August 2021 Amendment and Restatement Agreement August 2021 Amendment And Restatement Agreement [Member] August 2021 Amendment And Restatement Agreement 2028 Other Commitment, to be Paid, Year Two Write off of deferred financing costs Deferred Debt Issuance Cost, Writeoff Luna Pool Agency Limited Luna Pool Agency Limited ("Luna Pool Agency") Luna Pool Agency Limited [Member] Luna Pool Agency Limited Assets Assets [Abstract] Accounting Policies [Abstract] PT Pertamina (Persero) PT Pertamina (Persero) [Member] PT Pertamina (Persero) August 2024 Secured Term Loan and RCF August 2024 Secured Term Loan And Revolving Credit Facility [Member] August 2024 Secured Term Loan And Revolving Credit Facility 2018-built ethylene Two Thousand Eighteen Built Ethylene [Member] Two Thousand Eighteen Built Ethylene Ultranav Business Support ApS Ultranav Business Support ApS [Member] Ultranav Business Support ApS . Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Four Lessee, Operating Lease, Liability, to be Paid, after Year Four Additions Property, Plant, and Equipment, before Accumulated Depreciation, Addition Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Deferred taxes Deferred Income Tax Expense (Benefit) March 2023 Secured Term Loan March 2023 Senior Secured Term Loan Facility [Member] March 2023 Senior Secured Term Loan Facility Business Acquisition, Acquiree [Domain] Business Combination [Domain] JOLCO Japanese Operating Lease With Call Option [Member] Japanese Operating Lease With Call Option Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Operating revenues – Unigas Pool Operating Lease, Lease Income Entity Central Index Key Entity Central Index Key Gdynia, Poland Gdynia, Poland [Member] Gdynia, Poland Less: non-current portion of deferred financing costs Debt Issuance Costs, Noncurrent, Net Break Option, period Lessee, Operating Lease, Break Option, Notice Period Lessee, Operating Lease, Break Option, Notice Period Beginning balance Ending balance Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Underlying Asset Class [Axis] Underlying Asset Class [Axis] Additional paid-in capital Additional Paid in Capital, Common Stock Business Combination [Axis] Business Combination [Axis] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Schedule of Movement in Equity Method Investments Equity Method Investment Summarized Financial Data [Table Text Block] Equity Method Investment Summarized Financial Data [Table Text Block] 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Income Statement [Abstract] Stockholders’ Equity Equity, Attributable to Parent [Abstract] Unrestricted shares issued (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Insurance receivable Insurance Settlements Receivable, Current Investment, Name [Axis] Investment, Name [Axis] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Other Commitments [Domain] Other Commitments [Domain] 2009-Built Semi-Refrigerated Handysize Gas Carrier 2009-Built Semi-Refrigerated Handysize Gas Carrier [Member] 2009-Built Semi-Refrigerated Handysize Gas Carrier Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Subsequent Events Subsequent Events [Text Block] Accrued income, prepaid expenses and other current assets Increase Decrease In Accrued Income, Prepaid Expense And Other Current Assets Increase Or Decrease In Accrued Income, Prepaid Expenses And Other Current Assets. Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization [Roll Forward] Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization [Roll Forward] Total non-current assets Assets, Noncurrent Statement [Line Items] Statement [Line Items] Insurance claims receivables Increase (Decrease) in Insurance Settlements Receivable Total Assets Total assets Assets Office operating leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Entity [Domain] Entity [Domain] Interest income Investment Income, Net Interest expense Interest Expense, Nonoperating Thereafter Other Commitment, to be Paid, after Year Four Other Commitment, to be Paid, after Year Four March 2026 Senior Secured Term Loan March 2026 Senior Secured Term Loan [Member] March 2026 Senior Secured Term Loan 2026 Contractual Obligation, to be Paid, Remainder of Fiscal Year 2028 Long-Term Debt, Maturity, Year Two Schedule Of Description Of Business [Line Items] Schedule Of Description Of Business [Line Items] Schedule Of Description Of Business [Line Items] 2028 Contractual Obligation, to be Paid, Year Two Export Terminal Joint Venture Export Terminal Joint Venture [Member] Export terminal joint venture member. Repurchase of common stock (in shares) Stock Repurchased and Retired During Period, Shares Proceeds from derivative settlements Proceeds From Derivatives, Operating Activities Proceeds From Derivatives, Operating Activities Vessel operating expenses Vessel Operating Expenses Vessel Operating Expenses July 2026 Post-Delivery Senior Secured Term Loan July 2026 Post-Delivery Senior Secured Term Loan [Member] July 2026 Post-Delivery Senior Secured Term Loan Number of operated vessels Number Of Vessels In Fleet Number Of Vessels In Fleet Balloon payment Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Thereafter Contractual Obligation, to be Paid, after Year Four Contractual Obligation, to be Paid, after Year Four Revolving Credit Facility Revolving Credit Facility [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Direct financing cost of secured term loan and revolving credit facilities and unsecured bonds Payments of Debt Issuance Costs Navigator Holdings Ltd. Navigator Holdings Ltd. [Member] Navigator Holdings Ltd. JOLCO, Break Option Two JOLCO, Break Option Two [Member] JOLCO, Break Option Two Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Net cash provided by/(used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Asset, Held-for-Sale, Not Part of Disposal Group [Roll Forward] Asset, Held-for-Sale, Not Part of Disposal Group [Roll Forward] Asset, Held-for-Sale, Not Part of Disposal Group Number of vessels under lease Sale Leaseback Transaction, Number Sale Leaseback Transaction, Number Ownership [Domain] Ownership [Domain] Vessels under construction Other Commitment, Fiscal Year Maturity [Abstract] Number of contracts entered into Number Of Contracts Entered Number Of Contracts Entered Proceeds from secured term loan facilities and revolving credit facilities Proceeds from lines of credit Proceeds from Long-Term Lines of Credit Cost Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization [Abstract] Adjustments to reconcile net income to net cash provided by operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Difference in the carrying amount and the underlying equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net Net book value of vessels Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Consolidated Entity, Excluding Consolidated VIE Consolidated Entity, Excluding Consolidated VIE [Member] Schedule of Participation in Investments that are Accounted for Using the Equity Method Equity Method Investments [Table Text Block] Interest rate swap agreements Assets Derivative Asset Borrowing limit Debt Instrument, Borrowing Limit Debt Instrument, Borrowing Limit Other income Net other income Other Income Stock repurchases Stock Repurchased During Period, Value Unigas Vessels Unigas Vessels [Member] Unigas Vessels Time Charters Time Charters [Member] Time charters. Non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Operating Revenues Revenue from Contract with Customer [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Capitalized interest Construction In Progress, Capitalized Interest Construction In Progress, Capitalized Interest Profit from sale of vessels Profit from Sale of Vessel Profit from sale of vessel. Azane Fuel Solutions AS ("Azane") Azane Fuel Solutions AS [Member] Azane Fuel Solutions AS Financial Instruments Not Accounted for at Fair Value Financial Instruments Disclosure [Text Block] Vessels under Construction Construction in Progress [Member] Bunkers and lubricant oils Increase (Decrease) in Inventories Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Transfer to assets held for sale Property, Plant, and Equipment, before Accumulated Depreciation, Other Increase (Decrease) Commitments and Contingencies Disclosure [Abstract] Schedule of Assets and Liabilities Not Accounted for at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Operating income Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Vessels Under Construction Vessels Under Construction [Text Block] Vessels Under Construction Equity Method Investments [Roll Forward] Equity Method Investments [Roll Forward] Equity Method Investments 2026 Other Commitment, to be Paid, Remainder of Fiscal Year Derivative [Line Items] Derivative [Line Items] Other unrealized foreign exchange loss Unrealized Gain (Loss), Foreign Currency Transaction, after Tax Dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Common stock, shares issued (in shares) Common Stock, Shares, Issued Equity contributions to joint venture Equity Contributions To Joint Venture Equity contributions to joint venture. Equity Method Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] General Information and Basis of Presentation Business Description and Basis of Presentation [Text Block] Assets held for sale Beginning balance Ending balance Asset, Held-for-Sale, Not Part of Disposal Group Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Related Party Related Party [Member] Product and Service [Domain] Product and Service [Domain] Costs incurred to fulfill a contract Capitalized Contract Cost, Net Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Net income attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Drydocking Drydocking [Member] Drydocking Stockholders of Navigator Holdings Ltd. Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Other Commitments [Axis] Other Commitments [Axis] Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Subsequent Events [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Other non-current assets Other Assets, Noncurrent Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Schedule of Income (Expenses) with Related Parties Schedule Of Related Party Transactions Income Expenses [Table Text Block] Schedule Of Related Party Transactions Income Expenses. Secured Term Loan Secured Term Loan [Member] Secured Term Loan Manila, Philippines Manila, Philippines [Member] Manila, Philippines Share of results from equity method investment excluding amortized costs Income (Loss) From Equity Method Investments, Excluding Amortized Costs Income (Loss) From Equity Method Investments, Excluding Amortized Costs Total net operating expenses Operating Costs and Expenses Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Entity Registrant Name Entity Registrant Name Debt instrument, number of tranches paid Debt Instrument, Number Of Tranches Paid Debt Instrument, Number Of Tranches Paid Commitments and contingencies Commitments and Contingencies Total operating revenues Revenues Beginning balance Ending balance Cost of vessels Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Vessels under construction As of January 1, 2025 and 2026 Vessel under construction at December 31, 2025 and June 30, 2026 Construction In Progress, Net Construction In Progress, Net Share of result of equity method investments Share of results of equity method investments Share of results Income (Loss) from Equity Method Investments Bluestreak CO2 Limited ("Bluestreak") Bluestreak CO2 Limited [Member] Bluestreak CO2 Limited Accounts payable, accrued interest, accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Navigator Gas Services Philippines Inc. Variable Interest Entity, Primary Beneficiary, Navigator Gas Services Philippines Inc. [Member] Variable Interest Entity, Primary Beneficiary, Navigator Gas Services Philippines Inc. Counterparty Name [Axis] Counterparty Name [Axis] Expenses Operating Costs and Expenses [Abstract] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] 2029 Contractual Obligation, to be Paid, Year Three Reclassification from Vessels Assets Held For Sale Reclassification From Property Plant And Equipment Assets Held For Sale Reclassification From Property Plant And Equipment 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] July 2015 Santander Credit Facility B July 2015 Santander Credit Facility B [Member] July 2015 Santander Credit Facility B Operating lease term Lessee, Operating Lease, Term of Contract Geographical [Axis] Geographical [Axis] Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Restricted cash Restricted Cash Total tax paid during the period Income Tax Paid, before Refund Received Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Legal Entity [Axis] Legal Entity [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Lease term Sale Leaseback Transaction, Lease Term Total comprehensive income Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Ownership percentage Participation in investments accounted for using the equity method (as a percent) Equity Method Investment, Ownership Percentage Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Write-offs of fully depreciated assets Property, Plant, and Equipment, before Accumulated Depreciation, Disposition Schedule of Secured Term Loan Facilities Schedule of Senior Unsecured Bond Schedule of Debt [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] 2027 Long-Term Debt, Maturity, Year One Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Basic Deferred income Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Amounts to/(from) related parties Increase (Decrease) in Due to Related Parties Non-current secured term loan facilities and revolving credit facilities, net of current portion and non-current deferred financing costs Long-Term Debt, Excluding Current Maturities Accounts receivable, net of allowance for credit losses Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Ethylene Vessel Ethylene Carrier [Member] Ethylene carrier. Product and Service [Axis] Product and Service [Axis] Common stock Common Stock [Member] Secured term loan facilities and revolving credit facilities, net of current portion and deferred financing costs Loans Payable, Noncurrent BW Group BW Group [Member] BW Group Copenhagen Copenhagen [Member] Copenhagen. Cover [Abstract] PT Navigator Khatulistiwa Variable Interest Entity, Primary Beneficiary, PT Navigator Khatulistiwa [Member] Variable Interest Entity, Primary Beneficiary, PT Navigator Khatulistiwa 2002 Built Semi-Refrigerated Small Gas Carrier 2002 Built Semi-Refrigerated Small Gas Carrier [Member] 2002 Built Semi-Refrigerated Small Gas Carrier Derivative Contract [Domain] Derivative Contract [Domain] Navigator Crewing Services Philippines Inc. Variable Interest Entity, Primary Beneficiary, Navigator Crewing Philippines Inc. [Member] Variable Interest Entity, Primary Beneficiary, Navigator Crewing Philippines Inc. Ammonia Newbuild Vessels Ammonia Newbuild Vessels [Member] Ammonia Newbuild Vessels Total Liabilities and Stockholders’ Equity Liabilities and Equity Remaining borrowings available Debt Instrument, Remaining Borrowings Available Debt Instrument, Remaining Borrowings Available Distributions received from equity method investments Dividend Distribution From Joint Venture Dividend Distribution From Joint Venture Non-controlling interest Equity, Attributable to Noncontrolling Interest Related Party, Type [Domain] Related and Nonrelated Parties [Domain] London London [Member] London [Member] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Schedule of Vessels Under Construction Schedule Of Construction In Progress [Table Text Block] Schedule Of Construction In Progress Senior Unsecured Bonds Long-Term Debt [Text Block] Shareholder percentage Percentage Of Holding Held By Shareholder Percentage of holding held by shareholder. Non-current assets Assets, Noncurrent [Abstract] Net Book Value Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization [Abstract] General and administrative costs General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] October 2013 DB Credit Facility A October 2013 DB Credit Facility A [Member] October 2013 DB Credit Facility A 2000-Built Ethylene-Capable Semi-Refrigerated Handysize Gas Carrier 2000-Built Ethylene-Capable Semi-Refrigerated Handysize Gas Carrier [Member] 2000-Built Ethylene-Capable Semi-Refrigerated Handysize Gas Carrier Total interest paid during the period, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] 2027 Contractual Obligation, to be Paid, Year One Fine for Muhamad Kerry Adrianto Fine For Muhamad Kerry Adrianto [Member] Fine For Muhamad Kerry Adrianto Total Other Commitment 2024 Bonds October 2024 Bond issuance October 2024 Bonds [Member] October 2024 Bonds Deferred income Deferred Income, Noncurrent Credit Facility [Axis] Credit Facility [Axis] Time Charters, Expiring Within Five Years Time Charters, Expiring Within Five Years [Member] Time Charters, Expiring Within Five Years Discontinued Operations and Disposal Groups [Abstract] Schedule of Cash and Cash Equivalents [Table] Cash and Cash Equivalent [Table] Accounts payable Accounts Payable, Current Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] 2019-built ethylene Two Thousand Nineteen Built Ethylene [Member] Two Thousand Nineteen Built Ethylene Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Realized loss on non-designated derivatives instruments Realized loss on non-designated derivative instruments Realized loss on derivatives Gain (Loss) on Sale of Derivatives Current portion of secured term loan facilities and revolving credit facilities Long Term Debt Gross Current Long-term debt gross current. Additional Paid-in Capital Additional Paid-in Capital [Member] Supplemental Information Supplemental Cash Flow Elements [Abstract] Number of vessels acquired Number Of Vessels Acquired Number Of Vessels Acquired Total contractual obligations Contractual Obligation, Fiscal Year Maturity [Abstract] Navigator Greater Bay Joint Venture Navigator Greater Bay Joint Venture [Member] Navigator Greater Bay Joint Venture Cash and cash equivalents Cash and Cash Equivalent Long-term debt Long-Term Debt, Fiscal Year Maturity [Abstract] Variable interest entity, ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Charge for the period Depreciation, Depletion and Amortization Equity Method Investments and Joint Ventures [Abstract] 2027 Other Commitment, to be Paid, Year One Number of assets to be financed (in vessels) Line Of Credit Facility, Number Of Assets To Be Financed Line Of Credit Facility, Number Of Assets To Be Financed Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents Disclosure [Text Block] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Unigas International B.V. ("Unigas") Unigas International B V [Member] Unigas International B V . Current assets Assets, Current [Abstract] Vessels cargo capacity (in cbm) Vessels Cargo Capacity Vessels Cargo Capacity. Interest rate swap agreements Liability Derivative Liability Income taxes Income Tax Expense (Benefit) Collateralized Loan Obligations Collateralized Loan Obligations [Member] Equity contributions to joint venture entity Contributions To Equity Method Investments Contributions to equity method investments. Operating lease, annual gross rent Operating Leases, Annual Contractual Gross Rent Operating Leases, Annual Contractual Gross Rent Ethylene Capable Liquefied Gas Carriers Ethylene Capable Liquefied Gas Carriers [Member] Ethylene Capable Liquefied Gas Carriers Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Greater Bay Gas Greater Bay Gas [Member] Greater Bay Gas Number of vessels within Unigas Pool Property Subject to or Available for Operating Lease, Number of Units Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Percentage of vessels to be built financed Debt Instrument, Percentage Of Assets Under Construction Financed Debt Instrument, Percentage Of Assets Under Construction Financed Net income attributable to stockholders of Navigator Holdings Ltd. Net Income attributable to stockholders of Navigator Holdings Ltd. Net Income (Loss) Attributable to Parent Compensation Ordered to be Paid Compensation To Be Paid [Member] Compensation To Be Paid Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] July 2015 DB Credit Facility B July 2015 DB Credit Facility B [Member] July 2015 DB Credit Facility B Net proceeds from sale of vessels Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Enterprise Navigator Ethylene Terminal L.L.C. ("Export Terminal Joint Venture") Enterprise Navigator Ethylene Terminals L.L.C. [Member] Enterprise Navigator Ethylene Terminals L.L.C. Property, plant and equipment, net Property, Plant and Equipment, Other Types [Member] Senior Term Loan Facility Senior Term Loan Facility [Member] Senior Term Loan Facility Within 1 year Revenue Receivable Due In Next Twelve Months Revenue receivable due in next twelve months. Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Unrealized foreign exchange gain/(loss) Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Revenue Revenues [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]