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v3.20.4

Significant Accounting Policies - Defined Benefit Pension Plan (Details) | 12 Months Ended
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Dec. 31, 2020 age
Significant Accounting Policies |
Defined benefit pension plan age | 65
Defined Pension Plan required year of service prior to 2002 | 1 year

X
- Definition Represents the age to receive pension plan benefits. + References No definition available. + Details
Name: | res_DefinedBenefitPensionPlanAge
Namespace Prefix: | res_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum service requirement prior to 2002 to be eligible for pension plan benefits. + References No definition available. + Details
Name: | res_DefinedPensionPlanRequiredYearOfServicePriorTo2002
Namespace Prefix: | res_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration