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Income Taxes Components of Deferred Income Tax Amounts (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred Income Tax Assets |  |
Provision for bad debts | $ 9,210 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 8,012 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred compensation and other benefit obligations | 83,065 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 72,227 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Workers' compensation | 9,138 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 9,538 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Stock-based compensation | 14,572 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 12,067 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Credits and net operating loss carryforwards | 39,309 rhi_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards | 49,556 rhi_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards
Other | 25,316 us-gaap_DeferredTaxAssetsOther | 25,953 us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets | 180,610 us-gaap_DeferredTaxAssetsNet | 177,353 us-gaap_DeferredTaxAssetsNet
Deferred Income Tax Liabilities |  |
Amortization of intangible assets | (25,060)rhi_DeferredTaxLiabilitiesAmortizationOfIntangibleAssets | (23,305)rhi_DeferredTaxLiabilitiesAmortizationOfIntangibleAssets
Property and equipment basis differences | (12,384)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (8,098)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other | (7,261)us-gaap_DeferredTaxLiabilitiesOther | (6,626)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities | (44,705)us-gaap_DeferredTaxLiabilities | (38,029)us-gaap_DeferredTaxLiabilities
Valuation allowance | (29,561)us-gaap_DeferredTaxAssetsValuationAllowance | (37,044)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred income tax assets, net | $ 106,344 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 102,280 us-gaap_DeferredTaxAssetsLiabilitiesNet

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