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Employee Benefit Plans (Detail Textuals 1) (Supplemental Retirement Plan ('SERP'), USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Supplemental Retirement Plan ('SERP') |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Variable life insurance policies investment amount | $ 47,400,000 | $ 44,300,000 |
Fair value of plan assets | 13,963,000 | 11,103,000 |
Trading gains (losses) related to the SERP assets | $ 2,026,000 | $ 1,352,000 | $ (194,000)

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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: | na
Period Type: | duration

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- Definition This element represents the amount of variable life insurance policies included under the company-owned life insurance. + References No definition available. + Details
Name: | res_VariableLifeInsurancePoliciesInvestmentAmount
Namespace Prefix: | res_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant