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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	$ 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
Long-Lived Assets	55,004us-gaap_NoncurrentAssets				47,454us-gaap_NoncurrentAssets				55,004us-gaap_NoncurrentAssets	47,454us-gaap_NoncurrentAssets	42,068us-gaap_NoncurrentAssets
Domestic [Member]
Segment Reporting Information [Line Items]
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
Long-Lived Assets	52,936us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember				44,598us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember				52,936us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember	44,598us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember	40,062us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_DomesticMember
Foreign [Member]
Segment Reporting Information [Line Items]
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
Long-Lived Assets	$ 2,068us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember				$ 2,856us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember				$ 2,068us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = asgn_ForeignMember	$ 2,856us-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=6534315&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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
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: