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NOTES PAYABLE TO BANKS (Detail Textuals 1) (Revolving credit facility, Option 2, Eurodollar Borrowings)
 3 Months Ended
Mar. 31, 2015
Line of Credit Facility [Line Items]  
Description of reference rate basis Adjusted LIBOR
Minimum
  
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
/ us-gaap_LongtermDebtTypeAxis
= res_EurodollarBorrowingsMember
/ res_OptionAxis
= res_Option2Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum
  
Line of Credit Facility [Line Items]  
Range of margin based on quarterly debt covenant calculation 2.125%res_LineOfCreditFacilityMarginPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= res_EurodollarBorrowingsMember
/ res_OptionAxis
= res_Option2Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember