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Business Segment Information (Detail Textuals) | 12 Months Ended
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Dec. 31, 2012 Segment
Business Segment Information |
Number of reportable segments | 2
Percentage of assets related to international operations | 10.00%

X
- Definition This element represents the percentage of assets related to international operations are less than ten percent of entity's consolidated assets. + References No definition available. + Details
Name: | res_SegmentReportingMaximumPercentageOfAssets
Namespace Prefix: | res_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration