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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
OPERATING ACTIVITIES    
Net income $ 7,548us-gaap_NetIncomeLoss $ 39,388us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and other non-cash charges 67,555res_DepreciationAmortizationAndOtherNonCashItems 56,280res_DepreciationAmortizationAndOtherNonCashItems
Stock-based compensation expense 2,523us-gaap_ShareBasedCompensation 2,320us-gaap_ShareBasedCompensation
(Gain) loss on disposition of assets, net (958)us-gaap_GainLossOnDispositionOfAssets 2,232us-gaap_GainLossOnDispositionOfAssets
Deferred income tax benefit (18,413)us-gaap_DeferredIncomeTaxExpenseBenefit (10,192)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits for share-based payments (1,460)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (4,455)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
(Increase) decrease in assets:    
Accounts receivable 203,706us-gaap_IncreaseDecreaseInAccountsReceivable (31,043)us-gaap_IncreaseDecreaseInAccountsReceivable
Income taxes receivable 16,063us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 8,076us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Inventories 1,217us-gaap_IncreaseDecreaseInInventories (9,421)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses 621us-gaap_IncreaseDecreaseInPrepaidExpense 506us-gaap_IncreaseDecreaseInPrepaidExpense
Other current assets 806us-gaap_IncreaseDecreaseInOtherCurrentAssets 1,692us-gaap_IncreaseDecreaseInOtherCurrentAssets
Other non-current assets 225us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (117)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Increase (decrease) in liabilities:    
Accounts payable (57,944)us-gaap_IncreaseDecreaseInAccountsPayable 19,508us-gaap_IncreaseDecreaseInAccountsPayable
Income taxes payable 783us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 6,593us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accrued payroll and related expenses (22,346)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (6,181)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued insurance expenses 862us-gaap_IncreaseDecreaseInInsuranceLiabilities 302us-gaap_IncreaseDecreaseInInsuranceLiabilities
Accrued state, local and other taxes (841)us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable 1,503us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable
Other accrued expenses (17)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 60us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Pension liabilities 359us-gaap_IncreaseDecreaseInPensionPlanObligations 396us-gaap_IncreaseDecreaseInPensionPlanObligations
Long-term accrued insurance expenses 769res_IncreaseDecreaseInLongTermInsuranceExpenses 958res_IncreaseDecreaseInLongTermInsuranceExpenses
Other long-term liabilities (466)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (537)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities 200,592us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 77,868us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES    
Capital expenditures (103,492)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (40,295)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets 2,899us-gaap_ProceedsFromSaleOfProductiveAssets 2,862us-gaap_ProceedsFromSaleOfProductiveAssets
Net cash used for investing activities (100,593)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (37,433)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
FINANCING ACTIVITIES    
Payment of dividends (22,762)us-gaap_PaymentsOfDividends (22,986)us-gaap_PaymentsOfDividends
Borrowings from notes payable to banks 265,400us-gaap_ProceedsFromNotesPayable 216,400us-gaap_ProceedsFromNotesPayable
Repayments of notes payable to banks (334,300)us-gaap_RepaymentsOfNotesPayable (188,900)us-gaap_RepaymentsOfNotesPayable
Debt issue costs for notes payable to banks   (667)us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefits for share-based payments 1,460us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 4,455us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Cash paid for common stock purchased and retired (4,093)us-gaap_PaymentsForRepurchaseOfCommonStock (13,144)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used for financing activities (94,295)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (4,842)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 5,704us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 35,593us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 9,772us-gaap_CashAndCashEquivalentsAtCarryingValue 8,700us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 15,476us-gaap_CashAndCashEquivalentsAtCarryingValue 44,293us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flows disclosure:    
Interest paid, net of amounts capitalized 608us-gaap_InterestPaidNet 256us-gaap_InterestPaidNet
Income taxes paid, net 4,423us-gaap_IncomeTaxesPaidNet 19,999us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of noncash investing activities:    
Capital expenditures included in accounts payable $ 13,413res_CapitalExpendituresIncludedInAccountsPayable $ 22,432res_CapitalExpendituresIncludedInAccountsPayable