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Basis of Presentation of Interim Period Statements - Additional Information (Detail) - USD ($)
 3 Months Ended
Apr. 01, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Basis Of Presentation Of Interim Period Statements [Line Items]        
Revenue recognition professional employer services contracts term   1 year    
Professional employer service contract cancellation and termination period   30 days    
Cash and cash equivalents, maturity term   3 months    
Trading marketable securities   $ 0   $ 0
Allowance for doubtful accounts   261,000   268,000
Estimate of liability for unpaid safety incentives   21,800,000   $ 21,300,000
Income taxes received   $ 1,300,000 $ 1,200,000  
Anti-dilutive common shares excluded from calculation of diluted loss per share   110,797 193,549  
Minimum [Member]        
Basis Of Presentation Of Interim Period Statements [Line Items]        
Restricted marketable securities maturity period   180 days    
Maximum [Member]        
Basis Of Presentation Of Interim Period Statements [Line Items]        
Restricted marketable securities maturity period   2 years    
Subsequent Event [Member]        
Basis Of Presentation Of Interim Period Statements [Line Items]        
Settlement amount of workers' compensation liability costs with third party $ 9,500,000      
Quarterly payment due for settlement of workers' compensation liability costs with third party $ 593,250