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

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=asgn_DomesticMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=asgn_ForeignMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: