CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals)	12 Months Ended
Dec. 31, 2012
Statement Of Stockholders' Equity [Abstract]
Stock split conversion ratio	Three-for-two

Represents the conversion ratio used in the calculation of a stock split.

No definition available.

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