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Basis of Presentation of Interim Period Statements - Additional Information (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Company
shares
Mar. 31, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]      
Revenue recognition professional employer services contracts term 1 year    
Professional employer service contract cancellation and termination period 30 days    
Number of wholly-owned insurance companies | Company 2    
Cash and cash equivalents, maturity term 3 months    
Trading securities $ 0   $ 0
Allowance for doubtful accounts 78,000   78,000
Estimate of liability for unpaid safety incentives 24,200,000   24,800,000
Income taxes received $ 300,000 $ 1,300,000  
Anti-dilutive common shares excluded from calculation of diluted loss per share | shares 292,611 110,797  
Deferred income taxes $ 25,300,000   25,200,000
Restricted cash and investments $ 4,400,000   $ 4,500,000