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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenues:        
Professional employer service fees $ 165,776 $ 139,612 [1] $ 320,452 $ 266,846 [1]
Staffing services 37,641 42,347 [1] 73,932 81,513 [1]
Total revenues 203,417 181,959 [1] 394,384 348,359 [1]
Cost of revenues:        
Direct payroll costs 28,223 32,188 [1] 55,649 61,952 [1]
Payroll taxes and benefits 82,885 71,808 [1] 186,645 159,885 [1]
Workers' compensation 50,056 41,485 [1] 99,450 81,113 [1]
Total cost of revenues 161,164 145,481 [1] 341,744 302,950 [1]
Gross margin 42,253 36,478 [1] 52,640 45,409 [1]
Selling, general and administrative expenses 28,490 21,429 [1] 50,394 38,399 [1]
Depreciation and amortization 769 709 [1] 1,518 1,392 [1]
Income from operations 12,994 14,340 [1] 728 5,618 [1]
Other income (expense):        
Investment income 259 229 [1] 507 316 [1]
Interest expense (248) (562) [1] (508) (1,082) [1]
Other, net (5) (65) [1] (1) (79) [1]
Other expense, net 6 (398) [1] (2) (845) [1]
Income before income taxes 13,000 13,942 [1] 726 4,773 [1]
Provision for income taxes 4,478 5,040 [1] 207 1,699 [1]
Net income $ 8,522 $ 8,902 [1] $ 519 $ 3,074 [1]
Basic earnings per common share $ 1.18 $ 1.24 [1] $ 0.07 $ 0.43 [1]
Weighted average number of basic common shares outstanding 7,210 7,151 [1] 7,209 7,143 [1]
Diluted earnings per common share $ 1.16 $ 1.21 [1] $ 0.07 $ 0.42 [1]
Weighted average number of diluted common shares outstanding 7,328 7,327 [1] 7,323 7,328 [1]
Cash dividends per common share $ 0.22 $ 0.22 [1] $ 0.44 $ 0.44 [1]
As Previously Reported [Member]        
Revenues:        
Professional employer service fees   $ 140,048   $ 267,799
Staffing services   42,347   81,513
Total revenues   182,395   349,312
Cost of revenues:        
Direct payroll costs   32,188   61,952
Payroll taxes and benefits   72,146   160,440
Workers' compensation   41,897   81,780
Total cost of revenues   146,231   304,172
Gross margin   36,164   45,140
Selling, general and administrative expenses   21,278   38,253
Depreciation and amortization   709   1,392
Income from operations   14,177   5,495
Other income (expense):        
Investment income   148   236
Interest expense   (562)   (1,082)
Other, net   (65)   (78)
Other expense, net   (479)   (924)
Income before income taxes   13,698   4,571
Provision for income taxes   4,952   1,627
Net income   $ 8,746   $ 2,944
Basic earnings per common share   $ 1.22   $ 0.41
Weighted average number of basic common shares outstanding   7,151   7,143
Diluted earnings per common share   $ 1.19   $ 0.40
Weighted average number of diluted common shares outstanding   7,327   7,328
Cash dividends per common share   $ 0.22   $ 0.44
Restatement Adjustments [Member]        
Revenues:        
Professional employer service fees   $ (436)   $ (953)
Staffing services   0   0
Total revenues   (436)   (953)
Cost of revenues:        
Direct payroll costs   0   0
Payroll taxes and benefits   (338)   (555)
Workers' compensation   (412)   (667)
Total cost of revenues   (750)   (1,222)
Gross margin   314   269
Selling, general and administrative expenses   151   146
Depreciation and amortization   0   0
Income from operations   163   123
Other income (expense):        
Investment income   81   80
Interest expense   0   0
Other, net   0   (1)
Other expense, net   81   79
Income before income taxes   244   202
Provision for income taxes   88   72
Net income   $ 156   $ 130
Basic earnings per common share   $ 0.02   $ 0.02
Weighted average number of basic common shares outstanding   0   0
Diluted earnings per common share   $ 0.02   $ 0.02
Weighted average number of diluted common shares outstanding   0   0
[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements