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Significant Accounting Policies - Defined Benefit Pension Plan (Details)	12 Months Ended
	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