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v2.4.1.9

Segment Reporting (Revenue by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenues from External Customers [Line Items] |  |
Revenues | $ 430,045 us-gaap_SalesRevenueServicesNet | $ 406,851 us-gaap_SalesRevenueServicesNet
Domestic [Member] |  |
Revenues from External Customers [Line Items] |  |
Revenues | 410,756 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember | 386,953 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_DomesticMember
Foreign [Member] |  |
Revenues from External Customers [Line Items] |  |
Revenues | $ 19,289 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember | $ 19,898 us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = asgn_ForeignMember

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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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