Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Document Fiscal Period Focus EBP, Basis of Accounting [Policy Text Block] EBP, Note Receivable from Participant [Policy Text Block] Significant Accounting Policies Document Fiscal Year Focus Note 3 - Fair Value Measurements Schedule H, Line 4i - Schedule of Assets (Held at End of Year) Net assets available for benefits: Note 3 - Fair Value Measurements - Assets at Fair Value (Details) Amendment Flag Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Details) Schedule H, Line 4i - Schedule of Assets (Held at End of Year) 2 (Details) us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest EBP, Asset Held for Investment, Party-in-Interest [true false] Notes To Financial Statements Notes To Financial Statements [Abstract] Minimum [Member] dei_DocumentPeriodEndDate Document Period End Date Statistical Measurement [Domain] us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution EBP, Change in Net Asset Available for Benefit, Increase from Contribution Maximum [Member] Legal Entity [Axis] EBP, Schedule of Asset Held for Investment [Table] Cash Notes receivable from participants dei_EntityTaxIdentificationNumber Entity Tax Identification Number EBP, Investment, Fair Value and NAV [Text Block] Entity [Domain] Interest income on notes receivable from participants Entity Central Index Key Net appreciation in fair value of investments dei_EntityRegistrantName Entity Registrant Name EBP, Contribution [Policy Text Block] Entity Current Reporting Status EBP, Description of Plan [Text Block] us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment EBP, Asset Held for Investment EBP, Related Party and Party-in-Interest Transactions [Table] Current Fiscal Year End Date us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterDate EBP, Tax Determination Letter, Date us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease Total additions EBP, Change in Net Asset Available for Benefit, Increase us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment EBP, Fair Value, Investment, NAV, Unfunded Commitment Entity Shell Company Common Collective Trust [Member] Participants Entity Emerging Growth Company Entity Small Business Investments [Domain] EBP, Employer, Common Stock [Member] Withdrawals and distributions EBP, Nonemployer, Common Stock [Member] Accounting Policies [Abstract] Employer, net of forfeitures jbht_EBPMinimumVestingPeriod EBP, Minimum Vesting Period (Year) The minimum vesting period in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment us-gaap-ebp_EmployeeBenefitPlanTaxQualificationStatusExtensibleEnumeration EBP, Tax Qualification Status [Extensible Enumeration] EBP 71-0335111 001 [Member] EBP 71-0335111 001 us-gaap-ebp_EbpPlanName EBP, Plan Name Statement of Stockholders' Equity [Abstract] EBP, Tax Status [Text Block] us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount EBP, Forfeited Nonvested Account Investments Excluding Common Collective Trusts [Member] Investments Excluding Common Collective Trusts jbht_EBPTerminationOfPlanVestedPercentage EBP, Termination of Plan, Vested Percentage The percent of the employee stock purchase, saving, or similar plan (employee benefit plan (EBP) that vests upon termination. jbht_EBPAssetHeldForInvestmentParticipantLoanVariableRate EBP, Asset Held for Investment, Participant Loan, Variable Rate Variable rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). jbht_EBPAssetHeldForInvestmentParticipantLoanMaximumNumberOfLoansPerParticipant EBP, Asset Held for Investment, Participant Loan, Maximum Number of Loans per Participant The maximum number of loans a participant may have in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). General Loan [Member] General Loan Loan for Primary Residence [Member] Loan for Primary Residence jbht_EBPAssetHeldForInvestmentParticipantLoanLoanTerm EBP, Asset Held for Investment, Participant Loan, Loan Term (Year) Term on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Risk and Uncertainty [Policy Text Block] Equity Components [Axis] us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue Investments, fair value jbht_EBPInvestmentNumberOfSharesMaximumPercentOwnable EBP, Investment, Number of Shares, Maximum Percent Ownable Maximum number of shares or units of investment, as a percent, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). jbht_EBPInvestmentNumberOfSharesLimitationOnTransferOfExistingInvestmentsPercent EBP, Investment, Number of Shares, Limitation on Transfer of Existing Investments, Percent The limitation on the number of shares or units of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP) that may be transferred to a participant's account. Class of Stock [Axis] Equity Component [Domain] us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAllowanceForCreditLoss EBP, Note Receivable from Participant, Allowance for Credit Loss Fair Value, Inputs, Level 1 [Member] us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease Increase in net assets available for benefits Deductions from net assets attributed to: Additions to net assets attributed to: us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate EBP, Asset Held for Investment, Participant Loan, Interest Rate us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Contributions: Investment income: Interest and dividends Investments, at fair value: jbht_EBPVestingPercentageOverFourthYear EBP, Vesting Percentage The percent vesting over the fourth year. Investments, fair value Total investments Investments, fair value jbht_EBPVestingPercentageOverSecondYear EBP, Vesting Percentage The percent vesting over the second year. jbht_EBPVestingPercentageOverThirdYear EBP, Vesting Percentage The percent vesting over the third year. jbht_EBPVestingPercentageOverFirstYear EBP, Vesting Percentage The percent vesting over the first year. jbht_EmployeeBenefitPlanMinimumAgeOfParticipantRequiredToMakeMakeupContribution Employee Benefit Plan, Minimum Age of Participant Required to Make Make-up Contribution The minimum age a participant must be to make make-up contributions to the employee benefit plan. jbht_EmployeeBenefitPlanForfeitedNonvestedAccountDecrease Employee Benefit Plan, Forfeited Nonvested Account, Decrease Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). jbht_EBPMinimumHoursOfServiceWithinAYearRequiredForParticipantsToReceiveVestingServiceCredit EBP, Minimum Hours of Service Within a Year Required for Participants to Receive Vesting Service Credit The minimum hours of service a participant must complete within a year to receive vesting service credit. Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense jbht_EBPVestingPercentageOverFifthYear EBP, Vesting Percentage The percent vesting over the fifth year. jbht_EBPVestingPercentageOverSixthYear EBP, Vesting Percentage The percent vesting over the sixth year. Investment, Identifier [Axis] Employee Benefit Plan, Schedule of Asset [Text Block] Employee Benefit Plan, Schedule of Asset EBP, Accounting Policy [Table] Receivables: EBP, Description of Plan [Table] us-gaap-ebp_EmployeeBenefitPlanReceivable Total receivables Statement [Table] EBP, Tax Status [Table] Fair Value Hierarchy and NAV [Domain] us-gaap-ebp_EmployeeBenefitPlanPlanNumber EBP, Plan Number Statement of Financial Position [Abstract] us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration EBP, Investment, Current Value, Type [Extensible Enumeration] us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate EBP, Participant Contribution, Automatic, Deferral Rate Investment Type [Axis] Mutual Fund [Member] us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage EBP, Employer Contribution, Matching Percentage us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares EBP, Investment, Number of Shares (in shares) EBP, Schedule of Asset Held for Investment [Text Block] EBP, Use of Estimate [Policy Text Block] us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Related Party and Party-in-Interest [Domain] EBP, Employer, Common Stock Fund [Member] dei_DocumentType Document Type EBP, Summary of Accounting Policy [Text Block] Document Information [Line Items] EBP, Investment [Policy Text Block] jbht_PolicyTable Employer Document Information [Table] us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable Participants EBP, Trustee [Member] Accrued investment income Entity Interactive Data Current Statement [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Related Party and Party-in-Interest [Axis] EBP, Payment to Participant [Policy Text Block] us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustSellingPrice EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage EBP, Employer Contribution, Participant Compensation Matched, Percentage us-gaap-ebp_EmployeeBenefitPlanTaxDeterminationLetterObtained EBP, Tax Determination Letter, Obtained [true false] us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease Total deductions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Plan Termination [Text Block] us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit Net assets available for benefits Beginning of year End of year us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Investment, Fair Value and NAV [Table Text Block] us-gaap_PolicyTextBlockAbstract Accounting Policies EBP, Investment, Fair Value and NAV [Table] us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Retirement Plan Tax Status [Domain] us-gaap_TableTextBlock Notes Tables Qualified Plan [Member]