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EMPLOYEE BENEFIT PLAN - Trading results related to SERP (Details 1) (Non-qualified Supplemental Retirement Plan ("SERP"), USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Non-qualified Supplemental Retirement Plan ("SERP") |  |  |  |
Multiemployer Plans [Line Item] |  |  |  |
Gains (losses), net | $ 453 | $ 46 | $ 637 | $ 568

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- Definition This element represents the amount of trading gains (losses) of plan assets under the defined benefit plan. + References No definition available. + Details
Name: | res_DefinedBenefitPlanTradingGainsLosses
Namespace Prefix: | res_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_MultiemployerPlansLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration