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Accounts Receivable (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounts Receivable Additional Disclosures [Abstract]    
Trade receivables, allowance for doubtful accounts $ 900,000 $ 1,000,000
Accounts receivable, due date prior to applicable payroll date 1 day  
Unbilled accounts receivable [Abstract]    
Accrued worksite employee payroll cost 173,801,000 150,070,000
Unbilled revenues 50,286,000 44,483,000
Customer prepayments (24,459,000) (13,513,000)
Unbilled accounts receivable $ 199,628,000 $ 181,040,000