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Commitments and Contingencies Legal Proceedings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Workers' Compensation and Medical Malpractice Receivable, Current	$ 13,370asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent	$ 14,390asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent
Other Liabilities, Current	$ 20,729us-gaap_OtherLiabilitiesCurrent	$ 26,460us-gaap_OtherLiabilitiesCurrent

X

- Definition

Workers' Compensation and Medical Malpractice Receivable, Current

+ References

No definition available.

+ Details

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Namespace Prefix:	asgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Definition

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6911-107765



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6904-107765

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant