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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 | $ 441,023 us-gaap_SalesRevenueServicesNet | $ 442,443 us-gaap_SalesRevenueServicesNet | $ 434,424 us-gaap_SalesRevenueServicesNet | $ 406,851 us-gaap_SalesRevenueServicesNet | $ 396,070 us-gaap_SalesRevenueServicesNet | $ 394,400 us-gaap_SalesRevenueServicesNet | $ 380,779 us-gaap_SalesRevenueServicesNet | $ 351,852 us-gaap_SalesRevenueServicesNet | $ 1,724,741 us-gaap_SalesRevenueServicesNet | $ 1,523,101 us-gaap_SalesRevenueServicesNet | $ 1,031,935 us-gaap_SalesRevenueServicesNet
Long-Lived Assets | 51,928 us-gaap_NoncurrentAssets |  |  |  | 44,735 us-gaap_NoncurrentAssets |  |  |  | 51,928 us-gaap_NoncurrentAssets | 44,735 us-gaap_NoncurrentAssets | 40,105 us-gaap_NoncurrentAssets
Domestic [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,643,598 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 1,446,805 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 958,342 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember
Long-Lived Assets | 49,837 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember |  |  |  | 42,341 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember |  |  |  | 49,837 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 42,341 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 38,099 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 81,143 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | 76,296 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | 73,593 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember
Long-Lived Assets | $ 2,091 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember |  |  |  | $ 2,394 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember |  |  |  | $ 2,091 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | $ 2,394 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | $ 2,006 us-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=51669610&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 + Details
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