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Stock Plans Stock-Based Compensation Expense (Details) (Restricted stock and stock units, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restricted stock and stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 40,821 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember | $ 38,867 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember | $ 41,464 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember
Total unrecognized compensation cost, net of estimated forfeitures | $ 54,968 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember | $ 53,646 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember | $ 51,877 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax / us-gaap_AwardTypeAxis = rhi_RestrictedStockAndStockUnitsMember

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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Details
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Period Type: | duration