75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Statements of Net Assets Available for Benefits link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Statement of Changes in Net Assets Available for Benefits link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Description of Plan link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Summary of Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Fully Benefit-Responsive Investment Contracts link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Common Collective Trusts link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Related-Party Transactions and Parties of Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Income Tax Status link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Schedule link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Schedule of Assets link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Summary of Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - Schedule (Tables) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Schedule of Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Description of Plan (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - Summary of Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - Fair Value Measurements - Schedule of Plan's Assets Carried at Fair Value by Level within Fair Value Hierarchy (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - Fully Benefit-Responsive Investment Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - Income Tax Status (Details) link:presentationLink link:calculationLink link:definitionLink 75210 - Disclosure - Schedule - Schedule of Delinquent Participant Contributions (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Schedule of Assets - Schedule of Assets (Held at End of Year) (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Schedule of Assets - Schedule of Assets (Held at End of Year) (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Allocation Status [Domain] EBP, Receivable [Abstract] Receivables: EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Fiscal Period Focus EBP, Employer Contribution, Receivable Employer contributions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Investment Income (Loss), after Investment Expense Investment income EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Tax Status [Abstract] Corrective distributions Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Corrective Distributions Employee benefit plan change in net asset available for benefit decrease for corrective distributions. Employee Benefit Plan Other Change In Net Asset Employee benefit plan other change in net asset. Total other changes in net assets EBP, Description of Plan [Text Block] Description of Plan EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Investment, Identifier [Axis] EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Description of Plan [Line Items] EBP, Change in Net Asset Available for Benefit, Transfer to (from) Fund within ESOP Transfers from qualified plans EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Fair Value and NAV [Abstract] EBP, Liability [Abstract] Liabilities EBP, Accounting Policy [Line Items] Participant account balances and associated plan assets, transferred EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan EBP, Schedule of Asset Held for Investment [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Employee Benefit Plan Participant Contribution After-Tax Maximum Annual Compensation to Total Compensation Percentage Employee benefit plan participant contribution after-tax maximum annual compensation to total compensation percentage. Employee benefit plan participant contribution after-tax maximum annual compensation to total compensation percentage EBP, Allocation Status [Axis] EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable from participants, maximum borrowing amount EBP, Common Collective Trusts [Text Block] Ebp, common collective trusts. Common Collective Trusts Common Collective Trust [Member] Common Collective Trust Funds Amendment Flag EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash, Total Employer contributions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions: Employee Benefit Plan Participant Contribution After-tax Minimum Annual Compensation to Total Compensation Percentage Employee benefit plan participant contribution after-tax minimum annual compensation to total compensation percentage. Employee benefit plan participant contribution after-tax minimum annual compensation to total compensation percentage Note receivable from participants, minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Schedule of Delinquent Participant Contribution [Line Items] EBP, Participant Contribution, Receivable Participant contributions EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] Employee Benefit Plan Change in Net Asset Available for Benefit Increase (Decrease) Before Transfers Employee benefit plan change in net asset available for benefit increase (decrease) before transfers. Net increase before transfers Document Type Entity Central Index Key EBP, Fully Benefit-Responsive Investment Contract, Limitation on Transacting at Contract Value, Description Limitation on transacting at contract value, description EBP, Self-Directed Brokerage Account [Member] Self-directed Brokerage Accounts Subsequent Event Type [Domain] Employee Benefit Plan Participant Contribution After-tax Minimum Annual Compensation to Aggregate Compensation Percentage Employee benefit plan participant contribution after-tax minimum annual compensation to aggregate compensation percentage. Employee benefit plan participant contribution after-tax minimum annual compensation to aggregate compensation percentage EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Accounting Policy [Table] Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP Corporate Stock [Member] EBP corporate stock. Corporate Stock EBP, Description of Plan [Table] EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP Subsequent Event [Member] Subsequent Event Employee Benefit Plan Transfer From National Oilwell Defined Benefit Pension Plan Employee benefit plan transfer from national oilwell defined benefit pension plan. Transfer from National-Oilwell Defined Benefit Pension Plan EBP, Investment, Number of Shares Minimum [Member] Minimum EBP, Related Party and Party-in-Interest Transactions [Text Block] Related-Party Transactions and Parties of Interest Transactions EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Extract Companies, LLC Extract Companies, LLC [Member] Extract companies, LLC. Extract Note receivable from participants, loan minimum borrowing term Employee benefit plan, note receivable from participant, loan minimum borrowing term. Note receivable from participant, loan minimum borrowing term EBP, Other Liability Other Net assets available for benefits at: Employee Benefit Plan Net Assets Available For Benefits [Abstract] Employee benefit plan, net assets available for benefits. Document Information [Line Items] Fair Value Measured at Net Asset Value Per Share [Member] Investments Measured at Net Asset Value EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participant contributions EBP, Tax Determination Letter, Date Tax determination letter, date EBP, Liability Total liabilities EBP, Participant Contribution, Automatic, Deferral Rate Automatic enrollment and payroll deduction rate EBP, Fully Benefit-Responsive Investment Contract [Text Block] Fully Benefit-Responsive Investment Contracts EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Total investments, at fair value Investments, at fair value Use of Estimates EBP, Use of Estimate [Policy Text Block] Mutual Fund [Member] Mutual Funds Entity [Domain] Summary of Accounting Policies EBP, Summary of Accounting Policy [Text Block] Employee Benefit Plan, Participant Account Balances and Associated Plan Assets Employee benefit plan, participant account balances and associated plan assets. Employee benefit plan, participant account balances and associated plan assets EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements EBP, Description of Plan and Accounting Change [Abstract] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] Notes receivable from participants EBP, Note Receivable from Participant Document Period End Date Fair Value Hierarchy and NAV [Domain] EBP, Risk and Uncertainty [Policy Text Block] Risks and Uncertainties Note receivable from participants, maximum borrowing percentage of total value of plan assets Note receivable from participant, maximum borrowing to total account, percentage EBP, Tax Determination Letter, Obtained [true false] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Subsequent Event [Policy Text Block] Plan Management's Review of Subsequent Events Employee Benefit Plan Other Changes in Net Asset [Abstract] Employee benefit plan other changes in net asset. Other changes in net assets: EBP, Schedule of Delinquent Participant Contribution, Corrected Cover [Abstract] Investments [Domain] Employee Benefit Plan, Participant Contribution, After-tax, Maximum Annual Compensation To Aggregate Compensation, Percentage Employee benefit plan, participant contribution, after-tax, maximum annual compensation to aggregate compensation, percentage. Employee benefit plan, participant contribution, after-tax, maximum annual contribution to eligible compensation, percentage Employee Benefit Plan, Participant Contribution, Annual Vesting Percentage Employee benefit plan, participant contribution, annual vesting percentage. Employee benefit plan, participant contribution, annual vesting percentage EBP, Net Asset Available for Benefit Net assets available for benefits Beginning of year End of year EBP, Fully Benefit-Responsive Investment Contract, Termination, Description Contract termination description EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of Plan's Assets Carried at Fair Value by Level within Fair Value Hierarchy Fully benefit-responsive investment contract, description EBP, Fully Benefit-Responsive Investment Contract, Description EBP, Schedule of Asset Held for Investment [Abstract] Investments Excluding Common Collective Trust Funds EPB Investments Excluding Common Collective Trust Funds [Member] EPB investments excluding common collective trust funds. Employee Benefit Plan, Note Receivable from Participant, Loan Maximum Borrowing Term Employee benefit plan, note receivable from participant, loan maximum borrowing term. Note receivable from participants, loan maximum borrowing term Employee Benefit Plan, Participant Loan, Basis Spread on Variable Rate Employee benefit plan, participant loan, basis spread on variable rate. Participant loan, basis spread on variable rate Employee Benefit Plan, Employer Discretionary Contribution Amount Employee benefit plan, employer discretionary contribution amount. Employer discretionary contributions made EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, asset held for investment, investment, excluding plan interest in master trust, current value EBP, Schedule of Asset Held for Investment [Table Text Block] Schedule of Assets (Held at End of Year) Note receivable from participant, allowance for credit losses recorded Note receivable from participants, allowance for credit losses EBP, Fully Benefit-Responsive Investment Contract [Abstract] EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Asset Total assets Contributions EBP, Contribution [Policy Text Block] Employee Benefit Plan Common Collective Trusts [Abstract] Employee benefit plan common collective trusts. EBP, Schedule of Delinquent Participant Contribution [Abstract] EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee benefit plan, participant contribution, pretax, maximum annual contribution to eligible compensation, percentage EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] Document Information [Table] Legal Entity [Axis] EBP, Plan Name Employee Benefit Plan Schedule Of Asset Held For Investment [Text Block] Employee benefit plan, schedule of asset held for investment. Schedule of Assets EBP, Asset [Abstract] Assets Employee Benefit Plan, Participant Contribution, Maximum Aggregate Compensation, Percentage Employee benefit plan, participant contribution, maximum aggregate compensation, percentage. Maximum aggregate compensation, percentage Subsequent Event Type [Axis] EBP, Investment, Fair Value and NAV [Table] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Participant rollovers Keystone Tower Systems, Inc. [Member] Keystone tower systems, inc. Keystone Tower Systems, Inc. Keystone EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Asset Held for Investment EBP, Asset Held for Investment, Total Employee Benefit Plan Change In Net Asset Available For Benefit Decrease From Deemed Loan Distributions Employee benefit plan, change in net asset available for benefit, decrease from deemed loan distributions. Deemed loan distributions EBP, Tax Status [Text Block] Income Tax Status EBP, Schedule of Delinquent Participant Contribution, Not Corrected Maximum Maximum [Member] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP Entity Registrant Name Total receivables EBP, Receivable EBP, Asset Held for Investment, Participant Loan, Interest Rate Employee Benefit Plan Schedule of Delinquent Participant Contributions [Text Block] Employee benefit plan schedule of delinquent participant contributions. Schedule of Delinquent Participant Contributions EBP, Schedule of Delinquent Participant Contribution [Table Text Block] Schedule of Delinquent Participant Contributions EBP, Related Party and Party-in-Interest [Domain] Participant contribution, period after enrolment for eligible compensation Employee Benefit Plan, Participant Contribution, Period after Enrolment for Eligible Compensation, Employee benefit plan, participant contribution, period after enrolment for eligible compensation. EBP, Related Party and Party-in-Interest [Axis] EBP, Fully Benefit-Responsive Investment Contract, Limitation on Transacting at Contract Value, Not Probable [true false] Employee Benefit Plan Common Collective Trusts [Table] Employee benefit plan, common collective trusts. Total deductions EBP, Change in Net Asset Available for Benefit, Decrease EBP, Schedule of Delinquent Participant Contribution [Table] Employee Benefit Plan Common Collective Trusts [Line Items] Employee benefit plan common collective trusts. Level 1 Fair Value, Inputs, Level 1 [Member] Employee Benefit Plan, Effective Date Employee benefit plan, effective date. Employee benefit plan, effective date EBP, Schedule of Delinquent Participant Contribution, Late Repayment Included [true false] EBP 001 EBP 001 [Member] EBP 001. EBP, Tax Status [Line Items] Entity Tax Identification Number EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase after transfers EBP, Tax Status [Table] EBP, Allocated EBP, Allocated [Member] Fully benefit-responsive investment contracts at contract value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Fidelity [Member] State Street [Member] Great Gray Trust Company. Geode capital management. National Oilwell Varco Inc. State street. JP Morgan [Member] Dimensional funds. BlackRock. Vanguard. Notes Receivable From Participants [Member] Frost funds. Notes receivable from participants. Vanguard [Member] JP Morgan. Various [Member] SEI trust company. Fidelity. SEI Trust Company [Member] Various. BlackRock [Member] National Oilwell Varco Inc [Member] Frost Funds [Member] Van Kampen Funds [Member] Great Gray Trust Company [Member] Geode Capital Management [Member] Dimensional Funds [Member] Van kampen funds.