Employee Benefit Plans (Detail Textuals 2) (401(k) Plan, USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
401(k) Plan
Defined Contribution Pension and Other Postretirement Plans [Line Items]
Minimum percentage of annual contribution per employee	1.00%
Maximum percentage of annual contribution per employee	25.00%
Percentage of employer matching contribution	50.00%
Threshold limit percentage of employee compensation	6.00%
Maximum period of vesting in contribution of employer	after three years of service
Employer contribution	$ 5,088,000	$ 4,074,000	$ 2,485,000

Name:	res_DefinedContributionPensionAndOtherPostretirementPlansLineItems
Namespace Prefix:	res_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	res_DefinedContributionPlanEmployerMatchingContribution
Namespace Prefix:	res_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Minimum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

No definition available.

Name:	res_DefinedContributionPlanMinimumAnnualContributionPerEmployeePercent
Namespace Prefix:	res_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

This element represents the threshold limit in percentage of employees' compensation.

No definition available.

Name:	res_DefinedContributionPlanThresholdLimitPercentageOfEmployeeCompensation
Namespace Prefix:	res_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

This element represents the maximum period of vesting in contribution of employer.

No definition available.

Name:	res_MaximumPeriodOfVestingInContributionOfEmployer
Namespace Prefix:	res_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration