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Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 01, 2010
Sep. 30, 2010
Description of Business [Abstract]          
Number of years transition to comprehensive business performance solutions provider 27 years        
Segment Reporting [Abstract]          
Number of reportable segments 1        
Property, Plant and Equipment [Abstract]          
Amortization of capitalized computer software costs $ 3,600,000 $ 2,800,000 $ 1,600,000    
Unamortized computer software costs 7,200,000 8,200,000      
Health Insurance Costs [Abstract]          
Number of days cash in advance of beginning of reporting quarter United establishes cash funding rates 90 days        
Prepaid health insurance 9,000,000 9,000,000      
Required deposit for health care costs 3,500,000        
Amount which Plan Costs were less than the net premiums paid and owed 13,500,000        
Prepaid health insurance, current 4,500,000        
Premiums owed to United 2,100,000        
Workers' Compensation Costs [Abstract]          
Company's maximum economic burden for the first layer of claims per occurrence       1,000,000 1,000,000
Company's maximum aggregate economic burden for claims in excess of $1 million per policy year       5,000,000  
Reduction in accrued workers' compensation costs for changes in estimated losses 9,300,000 13,100,000      
U.S. Treasury rates that correspond with the weighted average estimated claim payout period (in hundredths) 0.80% 0.60%      
Incurred but not paid workers' compensation liabilities          
Beginning balance 111,685,000 104,791,000      
Accrued claims 42,900,000 37,772,000      
Present value discount (1,169,000) (868,000)      
Paid claims (32,583,000) (30,010,000)      
Ending balance 120,833,000 111,685,000 104,791,000    
Current portion of accrued claims 51,928,000 47,149,000      
Long-term portion of accrued claims 68,905,000 64,536,000      
Ending Balance 120,833,000 111,685,000 104,791,000    
Current portion of workers' compensation administrative fees accrued 1,000,000 2,300,000      
Undiscounted accrued workers' compensation costs 131,200,000 123,400,000      
Time period incurred claims expected to be paid recorded as restricted cash 1 year        
Time period incurred claims expected to be paid, included in deposits, a long-term asset Greater than 1 year        
Additional claim funds paid related to ACE Program 5,000,000        
Restricted Cash - workers compensation 51,900,000        
Deposits - workers' compensation 81,878,000 64,201,000      
Time period estimate of incurred claim costs to be paid included in short term liabilities 1 year        
Time period incurred claims expected to be paid, included in long-term liabilities Greater than 1 year        
Stock-Based Compensation [Abstract]          
Number of stock-based employee compensation plans 3        
Vesting period for Initial grants to new members of the Board of Directors 3 years        
Vesting period for officers and other management to be eligible for restricted stock grants, minimum 3 years        
Vesting period for officers and other management to be eligible for restricted stock grants, maximum 5 years        
Percentage of annual grants issued to directors that are vested (in hundredths) 100.00%        
Worksite Employees [Member]
          
Company-Sponsored 401 (k) Plans [Abstract]          
Percentage of eligible compensation matched, minimum (in hundredths) 0.00%        
Percentage of eligible compensation matched, maximum (in hundredths) 6.00%        
Matching contributions to the Plans 71,700,000 63,300,000 55,700,000    
Corporate Employees [Member]
          
Company-Sponsored 401 (k) Plans [Abstract]          
Percentage match of eligible corporate employees' contributions (in hundredths) 50.00%        
Percentage of eligible compensation matched, minimum (in hundredths) 0.00%        
Percentage of eligible compensation matched, maximum (in hundredths) 6.00%        
Corporate Plan and Worksite Employee Plan [Member]
          
Company-Sponsored 401 (k) Plans [Abstract]          
Matching contributions to the Plans $ 74,700,000 $ 65,900,000 $ 58,100,000    
Minimum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life 3 years        
Maximum [Member]
          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life 10 years        
Buildings and Improvements [Member] | Minimum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 5 years        
Buildings and Improvements [Member] | Maximum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 30 years        
Computer Hardware and Software and Acquired Technologies [Member] | Minimum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 1 year        
Computer Hardware and Software and Acquired Technologies [Member] | Maximum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 5 years        
Software Development Costs [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 3 years        
Furniture and Fixtures [Member] | Minimum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 5 years        
Furniture and Fixtures [Member] | Maximum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 7 years        
Aircraft [Member] | Minimum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 15 years        
Aircraft [Member] | Maximum [Member]
          
Property and Equipment, Estimated Useful Lives [Abstract]          
Estimated useful lives of property and equipment 20 years