XML 30 R19.htm IDEA: XBRL DOCUMENT v2.4.0.6
Basis of Presentation of Interim Period Statements (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Basis of Presentation of Interim Period Statements (Additional Textual) [Abstract]        
Revenue recognition professional employer services contract minimum term 1 year      
Professional employer service contract cancellation and termination period 30 days      
Allowance for doubtful accounts $ 383,000 $ 381,000    
Estimated future liability for unsettled workers' compensation 77,212,000 70,564,000 52,794,000 51,193,000
Estimate of liability for unpaid safety incentives 10,300,000 9,800,000    
ACE [Member] | Maximum [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance coverage with American Insurance Company 15,000,000      
ACE [Member] | Minimum [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance coverage with American Insurance Company 5,000,000      
Maryland [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance retention 1,000,000      
Maryland [Member] | ACE [Member] | Maximum [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance coverage with American Insurance Company 25,000,000      
Maryland [Member] | ACE [Member] | Minimum [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance coverage with American Insurance Company 1,000,000      
Colorado [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance retention 500,000      
Colorado [Member] | ACE [Member] | Maximum [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance coverage with American Insurance Company maximum limit Statutory Limit      
Colorado [Member] | ACE [Member] | Minimum [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance coverage with American Insurance Company 500,000      
Self-Insured States [Member]
        
Basis of Presentation of Interim Period Statements (Textual) [Abstract]        
Excess workers' compensation insurance retention $ 5,000,000