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