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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) | 1 Months Ended | 12 Months Ended
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Jan. 24, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Statement Of Stockholders' Equity [Abstract] |  |  |  |
Stock split conversion ratio | three-for-two | three-for-two | three-for-two | three-for-two

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- Definition Represents the conversion ratio used in the calculation of a stock split. + References No definition available. + Details
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Namespace Prefix: | res_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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