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v2.4.1.9

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

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- Definition Share repurchase program, amount authorized + References No definition available. + Details
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Namespace Prefix: | asgn_
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Balance Type: | debit
Period Type: | instant

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- 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=56944662&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |