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v2.4.1.9

Commitments and Contingencies (Details) (USD $) | Mar. 31, 2015 property | Dec. 31, 2014
--- | --- | ---
Other Commitments [Line Items] |  |
Workers' Compensation and Medical Malpractice Receivable, Current | $ 13,807,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent | $ 13,370,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent
Self Insurance Reserve | 1,900,000 us-gaap_SelfInsuranceReserve | 2,200,000 us-gaap_SelfInsuranceReserve
Letters of Credit Outstanding, Amount | 3,200,000 us-gaap_LettersOfCreditOutstandingAmount | 0 us-gaap_LettersOfCreditOutstandingAmount
Contingent consideration maximum | 11,000,000 asgn_Contingentconsiderationmaximum |
Liability for Uncertain Tax Positions, Noncurrent | 900,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | 900,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Other current liabilities | $ 17,740,000 us-gaap_OtherLiabilitiesCurrent | $ 20,729,000 us-gaap_OtherLiabilitiesCurrent
Number of Leased Properties Owned by Related Parties | 2 asgn_NumberOfLeasedPropertiesOwnedByRelatedParties |

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- 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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- Definition Number of Leased Properties Owned by Related Parties + References No definition available. + Details
Name: | asgn_NumberOfLeasedPropertiesOwnedByRelatedParties
Namespace Prefix: | asgn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Workers' Compensation and Medical Malpractice Receivable, Current + References No definition available. + Details
Name: | asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent
Namespace Prefix: | asgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant