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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitment and contingencies [Line Items]      
Deferred Rent Credit, Current $ 400,000us-gaap_DeferredRentCreditCurrent $ 410,000us-gaap_DeferredRentCreditCurrent  
Long-term Debt      
2013 18,250,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
2014 18,250,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
2015 18,250,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
2016 180,063,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive    
Thereafter 180,312,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive    
Total 415,125,000us-gaap_LongTermDebt    
Operating Leases      
2013 16,364,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2014 14,046,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2015 10,344,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2016 8,284,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2017 5,818,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 8,516,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 63,372,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Related Party      
2013 1,066,000us-gaap_OtherCommitmentDueInNextTwelveMonths    
2014 1,190,000us-gaap_OtherCommitmentDueInSecondYear    
2015 1,169,000us-gaap_OtherCommitmentDueInThirdYear    
2016 1,302,000us-gaap_OtherCommitmentDueInFourthYear    
2017 1,282,000us-gaap_OtherCommitmentDueInFifthYear    
Thereafter 6,659,000us-gaap_OtherCommitmentDueAfterFifthYear    
Total 12,668,000us-gaap_OtherCommitment    
Total      
2013 17,430,000us-gaap_ContractualObligationDueInNextTwelveMonths    
2014 15,236,000us-gaap_ContractualObligationDueInSecondYear    
2015 11,513,000us-gaap_ContractualObligationDueInThirdYear    
2016 9,586,000us-gaap_ContractualObligationDueInFourthYear    
2017 7,100,000us-gaap_ContractualObligationDueInFifthYear    
Thereafter 15,175,000us-gaap_ContractualObligationDueAfterFifthYear    
Total 76,040,000us-gaap_ContractualObligation    
Deferred rent liability, noncurrent 4,100,000us-gaap_DeferredRentCreditNoncurrent 3,600,000us-gaap_DeferredRentCreditNoncurrent  
Rent expense 19,000,000us-gaap_LeaseAndRentalExpense 16,400,000us-gaap_LeaseAndRentalExpense 12,500,000us-gaap_LeaseAndRentalExpense
Self Insurance Reserve 10,400,000us-gaap_SelfInsuranceReserve 11,600,000us-gaap_SelfInsuranceReserve  
Workers' Compensation and Medical Malpractice Receivable, Current 18,728,000asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent 21,200,000asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent  
Letters of credit outstanding 3,200,000us-gaap_LettersOfCreditOutstandingAmount 2,700,000us-gaap_LettersOfCreditOutstandingAmount  
contingent consideration maximum 16,000,000asgn_Contingentconsiderationmaximum    
Income tax reserve in other long-term liabilities 1,600,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 1,600,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent  
Other Liabilities, Current $ 21,776,000us-gaap_OtherLiabilitiesCurrent $ 27,487,000us-gaap_OtherLiabilitiesCurrent  
Apex Systems      
Total      
Number of leased properties owned by related parties (in number of properties) 2asgn_NumberOfLeasedPropertiesOwnedByRelatedParties
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember