Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012 LegalMatter	Jun. 30, 2012 LegalMatter
Commitments and Contingencies [Line Items]
Number of lawsuits filed against company related to litigation settlements	3	3
Litigation settlement expense (pre-tax)	$ 19	$ 19
Litigation settlement expense (after-tax charge)	$ 11.4	$ 11.4

This element represents the after-tax charge expenses incurred by the entity which are directly related and attributable to settlement of litigation.

No definition available.

Name:	rhi_LitigationSettlementExpenseAfterTaxCharge
Namespace Prefix:	rhi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration