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Summary of Operations and Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Unit
Segment
Branches
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2012
USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Number Of Branch Offices | Branches   55                  
Restricted marketable securities and workers' compensation deposits   $ 187,916,000 $ 58,533,000 [1]   $ 126,695,000 $ 101,828,000 $ 78,516,000 $ 43,821,000 $ 34,696,000 $ 31,133,000  
Operating and reporting segment | Segment   1                  
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   $ 268,000 291,000 $ 242,000             $ 381,000
Number of reporting units | Unit   1                  
Goodwill and intangible assets impairment   $ 0                  
Estimate of liability for unpaid safety incentives   21,300,000 14,200,000                
Income taxes received   4,100,000                  
Income taxes paid     $ 3,300,000 $ 9,000,000              
Anti-dilutive common shares excluded from calculation of diluted loss per share | shares     227,000                
Subsequent Event [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Settlement amount of workers' compensation liability costs with third party $ 10,000,000                    
Ecole Insurance Company [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Restricted marketable securities and workers' compensation deposits   $ 6,100,000                  
California [Member] | Revenue [Member] | Geographic Concentration Risk [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Percentage of revenue attributable to geographic area   78.00% 77.00% 74.00%              
Maryland [Member] | AICE [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance retention   $ 1,000,000                  
Colorado [Member] | AICE [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance retention   $ 2,000,000                  
Colorado [Member] | ACE Group [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance coverage with American Insurance Company   Statutory limits                  
Minimum [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Restricted marketable securities maturity period   180 days                  
Likelihood of tax benefit being realized upon settlement   50.00%                  
Minimum [Member] | ACE Group [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance coverage with ACE group   $ 5,000,000                  
Minimum [Member] | Maryland [Member] | ACE Group [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance coverage with ACE group   1,000,000                  
Minimum [Member] | Colorado [Member] | ACE Group [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance coverage with ACE group   $ 2,000,000                  
Maximum [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Restricted marketable securities maturity period   2 years                  
Maximum [Member] | AICE [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Workers Compensation Coverage Per Occurrence   $ 5,000,000                  
Maximum [Member] | ACE Group [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance coverage with ACE group   15,000,000                  
Maximum [Member] | Maryland [Member] | ACE Group [Member]                      
Basis Of Presentation Of Interim Period Statements [Line Items]                      
Excess workers' compensation insurance coverage with ACE group   $ 25,000,000                  
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements