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Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $)
Share data in Millions, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Dec. 02, 2013
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               $ 16,000,000asgn_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              
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 700,000asgn_BusinessAcquisitionContingentConsiderationAtFairValueAccruedEarnOut
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember		 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 6,400,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= asgn_CyberCodersMember		               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.          
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]                  
BusinessCombinationRecognizedGoodwill 7,076,000asgn_BusinessCombinationRecognizedGoodwill
/ us-gaap_BusinessAcquisitionAxis
= asgn_WhitakerMember		                
Effective Date of Acquisition             Dec. 02, 2013    
Name of Acquired Entity             Whitaker Medical, LLC    
Description of Acquired Entity             a provider of physician staffing services headquartered in Houston, Texas.    
Reason for Business Combination             The primary reason for the acquisition was to expand the Company's Physician staffing services.    
Purchase price             19,200,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= asgn_WhitakerMember		    
Cost of acquired entity, cash paid             18,500,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= asgn_WhitakerMember		    
Business Combination, Acquisition Related Costs     400,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= asgn_WhitakerMember		            
Maximum earn-out capped $ 5,000,000asgn_Contingentconsiderationmaximum
/ us-gaap_BusinessAcquisitionAxis
= asgn_WhitakerMember