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Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $)
Share data in Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2013
May 15, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2014
Dec. 05, 2013
Business Acquisition [Line Items]                
Maximum earn-out capped             $ 11,000,000asgn_Contingentconsiderationmaximum  
CyberCoders [Member]                
Business Acquisition [Line Items]                
BusinessCombinationRecognizedGoodwill               69,018,000asgn_BusinessCombinationRecognizedGoodwill
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember
Effective Date of Acquisition Dec. 05, 2013              
Name of Acquired Entity CyberCoders Holdings, Inc              
Business Acquisition, Description of Acquired Entity a provider of permanent placement services headquartered in Irvine, California.              
Reason for Business Combination The primary reason for the acquisition was to expand the Company's permanent placement services.              
Purchase price 96,600,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember		              
Cost of acquired entity, cash paid 93,600,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember		              
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out 3,000,000asgn_BusinessAcquisitionContingentConsiderationAtFairValueAccruedEarnOut
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember		              
Business Combination, Acquisition Related Costs   1,500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember		            
Business Acquisition, Goodwill, Expected Tax Deductible Amount               10,300,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember
Maximum earn-out capped               11,000,000asgn_Contingentconsiderationmaximum
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember
Apex Systems                
Business Acquisition [Line Items]                
BusinessCombinationRecognizedGoodwill     264,590,000asgn_BusinessCombinationRecognizedGoodwill
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember		          
Effective Date of Acquisition     May 15, 2012          
Name of Acquired Entity     Apex Systems, Inc.          
Business Acquisition, Description of Acquired Entity     a privately-owned provider of information technology staffing headquartered in Richmond, Virginia.          
Reason for Business Combination     The primary reason for the acquisition was to expand the Company's information technology staffing services.          
Purchase price     610,800,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember		          
Cost of acquired entity, cash paid     385,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember		 300,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember		        
Shares of Company's common stock issued (in shares)     14.3us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember		          
Business Combination, Acquisition Related Costs         $ 9,800,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= asgn_ApexSystemsMember		      
Whitaker [Member]                
Business Acquisition [Line Items]                
Effective Date of Acquisition           Dec. 02, 2013    
Name of Acquired Entity           Whitaker Medical, LLC    
Business Acquisition, Description of Acquired Entity           a provider of physician staffing services headquartered in Houston, Texas