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Subsequent Events (Details) (USD $)	0 Months Ended
	Dec. 02, 2013	Feb. 12, 2013	Feb. 01, 2015	Jul. 21, 2014	Jan. 16, 2015
Subsequent Event [Line Items]
Share repurchase program, amount authorized				$ 100,000,000asgn_Sharerepurchaseprogramamountauthorized
Proceeds from Divestiture of Businesses	28,700,000us-gaap_ProceedsFromDivestitureOfBusinesses	33,700,000us-gaap_ProceedsFromDivestitureOfBusinesses
Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, amount authorized					100,000,000asgn_Sharerepurchaseprogramamountauthorized / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from Divestiture of Businesses			$ 123,000,000us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Physician Segment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Sales Revenue, Services, Net			7.30%asgn_RevenueasPercentageofConsolidatedRevenue / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Revenue as percentage of consolidated revenue

+ References

No definition available.

+ Details

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X

- Definition

Share repurchase program, amount authorized

+ References

No definition available.

+ Details

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Namespace Prefix:	asgn_
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X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Details

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