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v2.4.1.9

Business Segments (Long-Lived Assets) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 475,808us-gaap_SalesRevenueServicesNet | $ 477,391us-gaap_SalesRevenueServicesNet | $ 468,081us-gaap_SalesRevenueServicesNet | $ 438,642us-gaap_SalesRevenueServicesNet | $ 422,906us-gaap_SalesRevenueServicesNet | $ 420,623us-gaap_SalesRevenueServicesNet | $ 407,244us-gaap_SalesRevenueServicesNet | $ 378,154us-gaap_SalesRevenueServicesNet | $ 1,859,922us-gaap_SalesRevenueServicesNet | $ 1,628,927us-gaap_SalesRevenueServicesNet | $ 1,134,614us-gaap_SalesRevenueServicesNet
Long-Lived Assets | 55,004us-gaap_NoncurrentAssets |  |  |  | 47,454us-gaap_NoncurrentAssets |  |  |  | 55,004us-gaap_NoncurrentAssets | 47,454us-gaap_NoncurrentAssets | 42,068us-gaap_NoncurrentAssets
Domestic [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,778,566us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 1,551,624us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 1,059,478us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember
Long-Lived Assets | 52,936us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember |  |  |  | 44,598us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember |  |  |  | 52,936us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 44,598us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 40,062us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 81,356us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | 77,303us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | 75,136us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember
Long-Lived Assets | $ 2,068us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember |  |  |  | $ 2,856us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember |  |  |  | $ 2,068us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | $ 2,856us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | $ 2,006us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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