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Basis of Presentation of Interim Period Statements (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 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 $ 362,000   $ 381,000      
Estimated future liability for unsettled workers' compensation 84,543,000 77,212,000 70,564,000 55,765,000 52,794,000 51,193,000
Estimate of liability for unpaid safety incentives 10,900,000   9,800,000      
AICE [Member] | Maximum [Member]
            
Basis of Presentation of Interim Period Statements (Textual) [Abstract]            
Excess workers' compensation insurance coverage with American Insurance Company 15,000,000          
AICE [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] | AICE [Member]
            
Basis of Presentation of Interim Period Statements (Textual) [Abstract]            
Excess workers' compensation insurance retention 1,000,000          
Maryland [Member] | AICE [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] | AICE [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] | AICE [Member]
            
Basis of Presentation of Interim Period Statements (Textual) [Abstract]            
Excess workers' compensation insurance retention 500,000          
Colorado [Member] | AICE [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] | AICE [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] | AICE [Member]
            
Basis of Presentation of Interim Period Statements (Textual) [Abstract]            
Excess workers' compensation insurance retention $ 5,000,000