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

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