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EARNINGS PER SHARE (Detail Textuals) (Restricted Shares, USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Restricted Shares |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Reduction in reported basic earnings per share under the two class method | $ 0.02 | $ 0.01 | $ 0.06 | $ 0.04

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

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- Definition Represents the amount of reduction in basic earining per share. + References No definition available. + Details
Name: | res_ReductionInBasicEarningsPerShare
Namespace Prefix: | res_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration