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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

X
- Details
Name: | res_DefinedContributionPensionAndOtherPostretirementPlansLineItems
Namespace Prefix: | res_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | res_DefinedContributionPlanEmployerMatchingContribution
Namespace Prefix: | res_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | res_DefinedContributionPlanMinimumAnnualContributionPerEmployeePercent
Namespace Prefix: | res_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the threshold limit in percentage of employees' compensation. + References No definition available. + Details
Name: | res_DefinedContributionPlanThresholdLimitPercentageOfEmployeeCompensation
Namespace Prefix: | res_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the maximum period of vesting in contribution of employer. + References No definition available. + Details
Name: | res_MaximumPeriodOfVestingInContributionOfEmployer
Namespace Prefix: | res_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration