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Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Business Acquisition [Line Items] |
Potential future earn-out obligations | $ 11.0 asgn_Contingentconsiderationmaximum

X
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents the maximum amount of consideration which may be paid. + References No definition available. + Details
Name: | asgn_Contingentconsiderationmaximum
Namespace Prefix: | asgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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