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Restatement of Previously Issued Financial Statements - Impact on Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Revenues:
Professional employer service fees	$ 153,332	$ 152,108	$ 139,612	$ 127,234	$ 129,154	$ 126,396	$ 112,238	$ 102,734	$ 108,224	$ 108,127	$ 94,456	$ 82,278	$ 572,286	$ 470,522	[1]	$ 393,085	[1]
Staffing services	40,425	46,617	42,347	39,166	45,313	48,503	38,566	33,451	37,117	41,727	35,304	29,733	168,555	165,833	[1]	143,881	[1]
Total revenues	193,757	198,725	181,959	166,400	174,467	174,899	150,804	136,185	145,341	149,854	129,760	112,011	740,841	636,355	[1]	536,966	[1]
Cost of revenues:
Direct payroll costs	30,704	35,308	32,188	29,764	34,584	37,087	29,311	25,417	28,308	31,585	26,611	22,371	127,964	126,399	[1]	108,875	[1]
Payroll taxes and benefits	77,162	75,237	71,808	88,077	67,793	64,308	58,853	72,146	56,532	55,982	51,050	58,599	312,284	263,100	[1]	222,163	[1]
Workers' compensation	44,734	45,290	41,485	39,628	35,090	33,661	115,518	29,182	38,265	32,671	28,459	24,032	171,137	213,451	[1]	123,427	[1]
Total cost of revenues	152,600	155,835	145,481	157,469	137,467	135,056	203,682	126,745	123,105	120,238	106,120	105,002	611,385	602,950	[1]	454,465	[1]
Gross margin	41,157	42,890	36,478	8,931	37,000	39,843	(52,878)	9,440	22,236	29,616	23,640	7,009	129,456	33,405	[1]	82,501	[1]
Selling, general and administrative expenses	26,338	25,440	21,429	16,970	20,335	21,679	17,958	14,093	16,378	16,820	14,506	11,735	90,177	74,065	[1]	59,439	[1]
Depreciation and amortization	738	721	709	683	663	646	613	584	550	521	506	460	2,851	2,506	[1]	2,037	[1]
(Loss) income from operations	14,081	16,729	14,340	(8,722)	16,002	17,518	(71,449)	(5,237)	5,308	12,275	8,628	(5,186)	36,428	(43,166)	[1]	21,025	[1]
Other income (expense):
Investment income	201	254	229	87	154	61	160	168	218	206	(342)	457	771	543	[1]	539	[1]
Interest expense	(416)	(467)	(562)	(520)	(42)	(43)	(44)	(44)	(46)	(48)	(64)	(80)	(1,965)	(173)	[1]	(238)	[1]
Other, net	(6)	(3)	(65)	(14)	(9)	178	(7)	(10)	(7)	3	1	(6)	(88)	152	[1]	(9)	[1]
Other income (expense), net	(221)	(216)	(398)	(447)	103	196	109	114	165	161	(405)	371	(1,282)	522	[1]	292	[1]
(Loss) income before income taxes														(42,644)		21,317
(Benefit from) provision for income taxes	2,413	5,540	5,040	(3,341)	7,452	8,848	(31,558)	(1,840)	843	3,711	2,704	(1,614)	9,652	(17,098)	[1]	5,644	[1]
Net (loss) income	$ 11,447	$ 10,973	$ 8,902	$ (5,828)	$ 8,653	$ 8,866	$ (39,782)	$ (3,283)	$ 4,630	$ 8,725	$ 5,519	$ (3,201)	$ 25,494	$ (25,546)	[1]	$ 15,673	[1]
Basic (loss) earnings per share	$ 1.59	$ 1.52	$ 1.24	$ (0.82)	$ 1.22	$ 1.24	$ (5.55)	$ (0.46)	$ 0.65	$ 1.22	$ 0.78	$ (0.46)	$ 3.55	$ (3.57)	[1]	$ 2.21	[1]
Weighted average number of basic common shares outstanding	7,203	7,201	7,151	7,135	7,122	7,177	7,173	7,170	7,165	7,150	7,082	7,022	7,173	7,160	[1]	7,105	[1]
Diluted (loss) earnings per share	$ 1.55	$ 1.49	$ 1.21	$ (0.82)	$ 1.20	$ 1.19	$ (5.55)	$ (0.46)	$ 0.62	$ 1.18	$ 0.75	$ (0.46)	$ 3.47	$ (3.57)	[1]	$ 2.12	[1]
Weighted average number of diluted common shares outstanding	7,396	7,362	7,327	7,135	7,234	7,428	7,173	7,170	7,477	7,425	7,374	7,022	7,353	7,160	[1]	7,397	[1]
Cash dividends per common share	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.13	$ 0.13	$ 0.13	$ 0.88	$ 0.76	[1]	$ 0.57	[1]
As Previously Reported [Member]
Revenues:
Professional employer service fees			$ 140,048	$ 127,751	$ 129,703	$ 126,456	$ 112,503	$ 101,689	$ 107,407	$ 106,244	$ 93,494	$ 81,818		$ 470,351		$ 388,963
Staffing services			42,347	39,166	45,313	48,503	38,566	33,451	37,117	41,727	35,304	29,733		165,833		143,881
Total revenues			182,395	166,917	175,016	174,959	151,069	135,140	144,524	147,971	128,798	111,551		636,184		532,844
Cost of revenues:
Direct payroll costs			32,188	29,764	34,584	37,087	29,311	25,417	28,308	31,585	26,611	22,296		126,399		108,800
Payroll taxes and benefits			72,146	88,294	67,836	65,061	61,130	72,817	58,320	57,977	53,483	59,123		266,844		228,903
Workers' compensation			41,897	39,883	38,555	115,593	30,776	27,600	33,595	28,223	24,978	21,821		212,524		108,617
Total cost of revenues			146,231	157,941	140,975	217,741	121,217	125,834	120,223	117,785	105,072	103,240		605,767		446,320
Gross margin			36,164	8,976	34,041	(42,782)	29,852	9,306	24,301	30,186	23,726	8,311		30,417		86,524
Selling, general and administrative expenses			21,278	16,975	20,281	21,213	17,958	14,369	16,948	16,808	14,494	11,811		73,821		60,061
Depreciation and amortization			709	683	663	646	613	584	550	521	506	460		2,506		2,037
(Loss) income from operations			14,177	(8,682)	13,097	(64,641)	11,281	(5,647)	6,803	12,857	8,726	(3,960)		(45,910)		24,426
Other income (expense):
Investment income			148	89	138	155	157	144	223	154	173	173		594		723
Interest expense			(562)	(520)	(42)	(43)	(44)	(44)	(46)	(48)	(64)	(80)		(173)		(238)
Other, net			(65)	(14)	(9)	178	(7)	(10)	(7)	3	1	(6)		152		(9)
Other income (expense), net			(479)	(445)	87	290	106	90	170	109	110	87		573		476
(Loss) income before income taxes														(45,337)		24,902
(Benefit from) provision for income taxes			4,952	(3,325)	6,150	(26,533)	4,104	(1,974)	1,412	3,972	2,950	(1,324)		(18,253)		7,010
Net (loss) income			$ 8,746	$ (5,802)	$ 7,034	$ (37,818)	$ 7,283	$ (3,583)	$ 5,561	$ 8,994	$ 5,886	$ (2,549)		$ (27,084)		$ 17,892
Basic (loss) earnings per share			$ 1.22	$ (0.81)	$ 0.99	$ (5.27)	$ 1.02	$ (0.50)	$ 0.78	$ 1.26	$ 0.83	$ (0.36)		$ (3.78)		$ 2.52
Weighted average number of basic common shares outstanding			7,151	7,135	7,122	7,177	7,173	7,170	7,165	7,150	7,082	7,022		7,160		7,105
Diluted (loss) earnings per share			$ 1.19	$ (0.81)	$ 0.97	$ (5.27)	$ 0.98	$ (0.50)	$ 0.74	$ 1.21	$ 0.80	$ (0.36)		$ (3.78)		$ 2.42
Weighted average number of diluted common shares outstanding			7,327	7,135	7,234	7,177	7,421	7,170	7,477	7,425	7,374	7,022		7,160		7,397
Cash dividends per common share			$ 0.22	$ 0.22	$ 0.22	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.13	$ 0.13	$ 0.13		$ 0.76		$ 0.57
Prior Period Adjustments [Member]
Revenues:
Professional employer service fees			$ (436)	$ (517)	$ (549)	$ (60)	$ (265)	$ 1,045	$ 817	$ 1,883	$ 962	$ 460
Staffing services			0	0	0	0	0	0	0	0	0	0
Total revenues			(436)	(517)	(549)	(60)	(265)	1,045	817	1,883	962	460
Cost of revenues:
Direct payroll costs			0	0	0	0	0	0	0	0	0	75
Payroll taxes and benefits			(338)	(217)	(43)	(753)	(2,277)	(671)	(1,788)	(1,995)	(2,433)	(524)
Workers' compensation			(412)	(255)	(3,465)	(81,932)	84,742	1,582	4,670	4,448	3,481	2,211
Total cost of revenues			(750)	(472)	(3,508)	(82,685)	82,465	911	2,882	2,453	1,048	1,762
Gross margin			314	(45)	2,959	82,625	(82,730)	134	(2,065)	(570)	(86)	(1,302)
Selling, general and administrative expenses			151	(5)	54	466	0	(276)	(570)	12	12	(76)
Depreciation and amortization			0	0	0	0	0	0	0	0	0	0		$ 0		$ 0
(Loss) income from operations			163	(40)	2,905	82,159	(82,730)	410	(1,495)	(582)	(98)	(1,226)
Other income (expense):
Investment income			81	(2)	16	(94)	3	24	(5)	52	(515)	284
Interest expense			0	0	0	0	0	0	0	0	0	0
Other, net			0	0	0	0	0	0	0	0	0	0
Other income (expense), net			81	(2)	16	(94)	3	24	(5)	52	(515)	284
(Benefit from) provision for income taxes			88	(16)	1,302	35,381	(35,662)	134	(569)	(261)	(246)	(290)
Net (loss) income			$ 156	$ (26)	$ 1,619	$ 46,684	$ (47,065)	$ 300	$ (931)	$ (269)	$ (367)	$ (652)		1,538		(2,219)
Basic (loss) earnings per share			$ 0.02	$ (0.01)	$ 0.23	$ 6.51	$ (6.57)	$ 0.04	$ (0.13)	$ (0.04)	$ (0.05)	$ (0.10)
Weighted average number of basic common shares outstanding			0	0	0	0	0	0	0	0	0	0
Diluted (loss) earnings per share			$ 0.02	$ (0.01)	$ 0.23	$ 6.46	$ (6.53)	$ 0.04	$ (0.12)	$ (0.03)	$ (0.05)	$ (0.10)
Weighted average number of diluted common shares outstanding			0	0	0	251	(248)	0	0	0	0	0
Cash dividends per common share			$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Prior Period Adjustments [Member] | Unsupported Non-GAAP Journal Entry Corrections [Member]
Revenues:
Professional employer service fees														171		4,122
Staffing services														0		0
Total revenues														171		4,122
Cost of revenues:
Direct payroll costs														0		75
Payroll taxes and benefits														(3,312)		(6,715)
Workers' compensation														242		14,146
Total cost of revenues														(3,070)		7,506
Gross margin														3,241		(3,384)
Selling, general and administrative expenses														244		(622)
Depreciation and amortization														0		0
(Loss) income from operations														2,997		(2,762)
Other income (expense):
Investment income														(51)		(184)
Interest expense														0		0
Other, net														0		0
Other income (expense), net														(51)		(184)
(Loss) income before income taxes														2,946		(2,946)
(Benefit from) provision for income taxes														1,218		(1,142)
Net (loss) income														$ 1,728		$ (1,804)
Basic (loss) earnings per share														$ 0.00		$ 0.00
Weighted average number of basic common shares outstanding														0		0
Diluted (loss) earnings per share														$ 0.00		$ 0.00
Weighted average number of diluted common shares outstanding														0		0
Prior Period Adjustments [Member] | Workers' Compensation Corrections [Member]
Revenues:
Professional employer service fees														$ 0		$ 0
Staffing services														0		0
Total revenues														0		0
Cost of revenues:
Direct payroll costs														0		0
Payroll taxes and benefits														0		0
Workers' compensation														685		664
Total cost of revenues														685		664
Gross margin														(685)		(664)
Selling, general and administrative expenses														0		0
Depreciation and amortization														0		0
(Loss) income from operations														(685)		(664)
Other income (expense):
Investment income														0		0
Interest expense														0		0
Other, net														0		0
Other income (expense), net														0		0
(Loss) income before income taxes														(685)		(664)
(Benefit from) provision for income taxes														(241)		(234)
Net (loss) income														$ (444)		$ (430)
Basic (loss) earnings per share														$ 0.00		$ 0.00
Weighted average number of basic common shares outstanding														0		0
Diluted (loss) earnings per share														$ 0.00		$ 0.00
Weighted average number of diluted common shares outstanding														0		0
Prior Period Adjustments [Member] | Payroll Tax Corrections [Member]
Revenues:
Professional employer service fees														$ 0		$ 0
Staffing services														0		0
Total revenues														0		0
Cost of revenues:
Direct payroll costs														0		0
Payroll taxes and benefits														(432)		(25)
Workers' compensation														0		0
Total cost of revenues														(432)		(25)
Gross margin														432		25
Selling, general and administrative expenses														0		0
Depreciation and amortization														0		0
(Loss) income from operations														432		25
Other income (expense):
Investment income														0		0
Interest expense														0		0
Other, net														0		0
Other income (expense), net														0		0
(Loss) income before income taxes														432		25
(Benefit from) provision for income taxes														178		10
Net (loss) income														$ 254		$ 15
Basic (loss) earnings per share														$ 0.00		$ 0.00
Weighted average number of basic common shares outstanding														0		0
Diluted (loss) earnings per share														$ 0.00		$ 0.00
Weighted average number of diluted common shares outstanding														0		0
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements

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