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Restatement of Previously Issued Condensed Consolidated Financial Statements - Impact on Condensed Consolidated Statement of Operations (Unaudited) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenues:    
Professional employer service fees $ 154,678 $ 127,234 [1]
Staffing services 36,290 39,166 [1]
Total revenues 190,968 166,400 [1]
Cost of revenues:    
Direct payroll costs 27,427 29,764 [1]
Payroll taxes and benefits 103,760 88,077 [1]
Workers' compensation 49,394 39,628 [1]
Total cost of revenues 180,581 157,469 [1]
Gross margin 10,387 8,931 [1]
Selling, general and administrative expenses 21,904 16,970 [1]
Depreciation and amortization 749 683 [1]
Loss from operations (12,266) (8,722) [1]
Other income (expense):    
Investment income 248 87 [1]
Interest expense (260) (520) [1]
Other, net 4 (14) [1]
Other expense, net (8) (447) [1]
Loss before income taxes (12,274) (9,169) [1]
Benefit from income taxes (4,271) (3,341) [1]
Net loss $ (8,003) $ (5,828) [1]
Basic loss per common share $ (1.11) $ (0.82) [1]
Weighted average number of basic common shares outstanding 7,208 7,135 [1]
Diluted loss per common share $ (1.11) $ (0.82) [1]
Weighted average number of diluted common shares outstanding 7,208 7,135 [1]
Cash dividends per common share $ 0.22 $ 0.22 [1]
As Previously Reported [Member]    
Revenues:    
Professional employer service fees   $ 127,751
Staffing services   39,166
Total revenues   166,917
Cost of revenues:    
Direct payroll costs   29,764
Payroll taxes and benefits   88,294
Workers' compensation   39,883
Total cost of revenues   157,941
Gross margin   8,976
Selling, general and administrative expenses   16,975
Depreciation and amortization   683
Loss from operations   (8,682)
Other income (expense):    
Investment income   89
Interest expense   (520)
Other, net   (14)
Other expense, net   (445)
Loss before income taxes   (9,127)
Benefit from income taxes   (3,325)
Net loss   $ (5,802)
Basic loss per common share   $ (0.81)
Weighted average number of basic common shares outstanding   7,135
Diluted loss per common share   $ (0.81)
Weighted average number of diluted common shares outstanding   7,135
Cash dividends per common share   $ 0.22
Restatement Adjustments [Member]    
Revenues:    
Professional employer service fees   $ (517)
Staffing services   0
Total revenues   (517)
Cost of revenues:    
Direct payroll costs   0
Payroll taxes and benefits   (217)
Workers' compensation   (255)
Total cost of revenues   (472)
Gross margin   (45)
Selling, general and administrative expenses   (5)
Depreciation and amortization   0
Loss from operations   (40)
Other income (expense):    
Investment income   (2)
Interest expense   0
Other, net   0
Other expense, net   (2)
Loss before income taxes   (42)
Benefit from income taxes   (16)
Net loss   $ (26)
Basic loss per common share   $ 0.00
Weighted average number of basic common shares outstanding   0
Diluted loss per common share   $ 0.00
Weighted average number of diluted common shares outstanding   0
[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements