CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (Parentheticals)	3 Months Ended
Mar. 31, 2012
Statement Of Stockholders Equity [Abstract]
Stock split, Conversion ratio	3 For 2

This item 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