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Business Segments (Revenue by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total 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
Domestic [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total 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
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total 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

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