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NOTES PAYABLE TO BANKS (Detail Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Line of Credit Facility [Line Items]  
Amount of credit facility $ 350us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Percentage of ownership 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Term of line of credit facility 5 years
Loan origination fees and other debt related costs 3.0res_LoanOriginationFeesAndOtherDebtRelatedCosts
Non-current other assets net 1.1res_NonCurrentOtherAssetsNet
Description of variable rate basis of debt instrument
Revolving loans under the Revolving Credit Agreement bear interest at one of the following two rates, at the Company’s election:
 
 
●
the Base Rate, which is the highest of Bank of America’s “prime rate” for the day of the borrowing, a fluctuating rate per annum equal to the Federal Funds Rate plus 0.50%, and a rate per annum equal to the one (1) month LIBOR rate plus 1.00%; in each case plus a margin that ranges from 0.125% to 1.125% based on a quarterly debt covenant calculation; or
 
 
●
with respect to any Eurodollar borrowings, Adjusted LIBOR (which equals LIBOR as increased to account for the maximum reserve percentages established by the U.S. Federal Reserve) plus a margin ranging from 1.125% to 2.125%, based upon a quarterly debt covenant calculation.
Revolving credit facility | Minimum  
Line of Credit Facility [Line Items]  
Fees on unused portion of facility 0.225%res_MarginOnUnusedCreditFacilityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Revolving credit facility | Maximum  
Line of Credit Facility [Line Items]  
Fees on unused portion of facility 0.325%res_MarginOnUnusedCreditFacilityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Revolving credit facility | Option 1 A  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 0.50%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ res_OptionAxis
= res_Option1Member
Description of reference rate basis Federal Funds Rate
Revolving credit facility | Option 1 A | Minimum  
Line of Credit Facility [Line Items]  
Range of margin based on quarterly debt covenant calculation 0.125%res_LineOfCreditFacilityMarginPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ res_OptionAxis
= res_Option1Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Revolving credit facility | Option 1 A | Maximum  
Line of Credit Facility [Line Items]  
Range of margin based on quarterly debt covenant calculation 1.125%res_LineOfCreditFacilityMarginPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ res_OptionAxis
= res_Option1Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Revolving credit facility | Option 1 B  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 1.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ res_OptionAxis
= res_Option1BMember
Description of reference rate basis LIBOR rate
Revolving credit facility | Option 1 B | Minimum  
Line of Credit Facility [Line Items]  
Range of margin based on quarterly debt covenant calculation 0.125%res_LineOfCreditFacilityMarginPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ res_OptionAxis
= res_Option1BMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Revolving credit facility | Option 1 B | Maximum  
Line of Credit Facility [Line Items]  
Range of margin based on quarterly debt covenant calculation 1.125%res_LineOfCreditFacilityMarginPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ res_OptionAxis
= res_Option1BMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Letter of credit subfacility  
Line of Credit Facility [Line Items]  
Amount of credit facility 50us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
Swingline subfacility  
Line of Credit Facility [Line Items]  
Amount of credit facility $ 35us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= res_LetterOfCreditSwinglineSubfacilityMember