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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible Assets [Line Items] |  |  |
Document Period End Date | Dec. 31, 2014 |  |
Amortization of intangible assets | $ 22,130 us-gaap_AmortizationOfIntangibleAssets | $ 20,943 us-gaap_AmortizationOfIntangibleAssets | $ 17,047 us-gaap_AmortizationOfIntangibleAssets
Intangible assets subject to amortization: |  |  |
Gross Carrying Amount | 163,027 us-gaap_FiniteLivedIntangibleAssetsGross | 163,724 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | 90,743 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 68,876 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net Carrying Amount | 72,284 us-gaap_FiniteLivedIntangibleAssetsNet | 94,848 us-gaap_FiniteLivedIntangibleAssetsNet |
Intangible assets not subject to amortization: |  |  |
Trademarks, Carrying Amount | 178,325 us-gaap_IndefiniteLivedTrademarks | 178,775 us-gaap_IndefiniteLivedTrademarks |
Goodwill | 512,060 us-gaap_Goodwill | 514,426 us-gaap_Goodwill | 444,084 us-gaap_Goodwill
Total |  |  |
Gross Carrying Amount | 341,352 asgn_IntangibleAssetsGrossIncludingGoodwill | 342,499 asgn_IntangibleAssetsGrossIncludingGoodwill |
Net Carrying Amount | 250,609 us-gaap_IntangibleAssetsNetIncludingGoodwill | 273,623 us-gaap_IntangibleAssetsNetIncludingGoodwill |
Customer Relationships [Member] |  |  |
Intangible assets subject to amortization: |  |  |
Gross Carrying Amount | 101,141 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 101,697 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | 53,434 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 38,930 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Net Carrying Amount | 47,707 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 62,767 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Customer Relationships [Member] | Minimum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 3 months |  |
Customer Relationships [Member] | Maximum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 10 years |  |
Contractor Relations [Member] |  |  |
Intangible assets subject to amortization: |  |  |
Gross Carrying Amount | 39,332 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = asgn_ContractorRelationsMember | 39,384 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = asgn_ContractorRelationsMember |
Accumulated Amortization | 32,021 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = asgn_ContractorRelationsMember | 28,321 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = asgn_ContractorRelationsMember |
Net Carrying Amount | 7,311 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = asgn_ContractorRelationsMember | 11,063 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = asgn_ContractorRelationsMember |
Contractor Relations [Member] | Minimum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 2 years |  |
Contractor Relations [Member] | Maximum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 7 years |  |
Computer Software, Intangible Asset [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 6 years |  |
Intangible assets subject to amortization: |  |  |
Gross Carrying Amount | 18,900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 18,900 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
Accumulated Amortization | 3,366 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 263 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
Net Carrying Amount | 15,534 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 18,637 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
Noncompete Agreements [Member] |  |  |
Intangible assets subject to amortization: |  |  |
Gross Carrying Amount | 3,654 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 3,743 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Accumulated Amortization | 1,922 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 1,362 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Net Carrying Amount | $ 1,732 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | $ 2,381 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Noncompete Agreements [Member] | Minimum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 2 years |  |
Noncompete Agreements [Member] | Maximum [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Estimated Useful Life | 7 years |  |

X
- Definition Gross amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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