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EMPLOYEE BENEFIT PLAN - Trading results related to SERP (Details 1) (Supplemental Retirement Plan ('SERP'), USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Supplemental Retirement Plan ('SERP')
Defined Benefit Plan Disclosure [Line Items]
Gains (losses), net	$ (470)	$ (114)	$ 180	$ 122

X

- Definition

The element represents gain loss on defined benefit plan assets.

+ References

No definition available.

+ Details

Name:	res_GainLossOnDefinedBenefitPlanAssets
Namespace Prefix:	res_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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