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Stockholders' Equity Number and Cost of Employee Stock Plan Repurchases (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity [Abstract]      
Employee stock plan repurchased (in shares) 462rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares 1,157rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares 1,661rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodShares
Employee stock plan repurchased $ 22,386rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue $ 44,169rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue $ 50,045rhi_StockRepurchasedUnderEmployeeStockPlanDuringPeriodValue