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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Advertising Costs | $ 42,335,000 us-gaap_AdvertisingExpense | $ 38,845,000 us-gaap_AdvertisingExpense | $ 42,256,000 us-gaap_AdvertisingExpense
Valuation allowance | 29,561,000 us-gaap_DeferredTaxAssetsValuationAllowance | 37,044,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Provision for workers' compensation claims threshold | 500,000 rhi_ProvisionForWorkersCompensationClaims |  |
Internal-use software development costs | $ 24,367,000 us-gaap_PaymentsToDevelopSoftware | $ 13,027,000 us-gaap_PaymentsToDevelopSoftware | $ 19,083,000 us-gaap_PaymentsToDevelopSoftware
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized life assigned to identifiable intangible assets (in years) | 2 years |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortized life assigned to identifiable intangible assets (in years) | 5 years |  |
Computer Hardware | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Computer Hardware | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Computer Software | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Computer Software | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Furniture and Fixtures |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Leasehold Improvements | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The cash outflow associated with the development or modification of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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