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EMPLOYEE BENEFIT PLAN - Unrealized gains, net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
SERP |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrealized gains, net | $ 370 | $ 861 | $ 4,006 | $ 1,246

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |