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Quarterly Financial Information - Quarterly Balance Sheets (Detail) - USD ($) $ in Thousands	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		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 25,218	$ 16,881	$ 4,439	$ 15,205	$ 11,544	[1]	$ 51,985	$ 47,869	$ 66,268	$ 93,557	[1]	$ 45,747	[1]
Marketable securities	0	5,071	0	21,670	29,957	[1]	34,760	32,033	31,013
Trade accounts receivable, net	90,529	155,706	137,862	130,376	102,627	[1]	129,761	104,008	95,956
Income taxes receivable	1,038	0	9,194	14,131	11,947	[1]	14,296	34,803	3,059
Prepaid expenses and other	3,173	4,268	5,689	6,658	3,813	[1]	4,966	5,283	4,621
Restricted certificates of deposit	10,000	0	26,015	0	0	[1]
Restricted marketable securities and workers' compensation deposits	76,110	30,850	21,343	12,533	3,776	[1]	0	0	0
Deferred income taxes	20,941	18,972	18,983	18,972	19,138	[1]	20,263	11,977	11,969
Total current assets	227,009	231,748	223,525	219,545	182,802	[1]	256,031	235,973	212,886
Marketable securities	6,082	6,089	6,048	6,034	20,930	[1]	15,984	10,597	6,680
Property, equipment and software, net	22,820	22,465	22,648	22,648	22,675	[1]	22,576	21,786	21,779
Restricted certificates of deposit	0	88,320	88,320	114,335	114,335	[1]	20,943	20,943	12,789
Restricted marketable securities and workers' compensation deposits	187,916	126,695	101,828	78,516	58,533	[1]	43,821	34,696	31,133
Other assets	5,130	4,728	4,840	4,960	5,306	[1]	3,836	3,979	4,028
Goodwill	47,820	47,820	47,820	47,820	47,820	[1]	47,820	47,820	47,820
Total assets	496,777	527,865	495,029	493,858	452,401	[1]	411,011	375,794	337,115
Current liabilities:
Line of credit	0	0	3,223	5,772
Current portion of long-term debt	19,833	34,887	27,220	25,220	25,220	[1]	220	220	220
Accounts payable	3,217	3,182	2,419	3,500	2,719	[1]	2,839	2,435	2,382
Accrued payroll, payroll taxes and related benefits	121,343	161,127	140,756	149,999	115,837	[1]	129,264	104,083	112,669
Income taxes payable	0	4,478	0	0
Other accrued liabilities	6,166	2,383	4,845	6,190	6,230	[1]	5,440	3,227	2,541
Workers' compensation claims liabilities	65,581	66,448	65,388	61,830	61,064	[1]	58,017	54,040	44,383
Safety incentives liability	21,253	19,960	18,147	15,499	14,232	[1]	14,063	12,718	12,192
Total current liabilities	237,393	292,465	261,998	268,010	225,302	[1]	209,843	176,723	174,387
Long-term workers' compensation claims liabilities	190,094	181,323	173,856	169,893	164,214	[1]	162,484	162,246	84,525
Long-term debt	0	0	14,723	19,778	19,833	[1]	4,888	4,943	4,998
Deferred income taxes	13,256	8,421	8,421	8,421	8,557	[1]	4,973	10,392	10,392
Customer deposits and other long-term liabilities	1,483	1,475	1,487	1,534	1,675	[1]	1,888	1,967	1,799
Total liabilities	$ 442,226	$ 483,684	$ 460,485	$ 467,636	$ 419,581	[1]	$ 384,076	$ 356,271	$ 276,101
Commitments and contingencies						[1]
Stockholders' equity:
Common stock, $.01 par value	$ 72	$ 72	$ 72	$ 71	$ 71	[1]	$ 72	$ 72	$ 72
Additional paid-in capital	6,964	6,416	6,173	5,165	4,410	[1]	5,605	5,798	6,203
Accumulated other comprehensive income (loss)	(31)	10	4	21	(23)	[1]	(18)	(50)	(37)
Retained earnings	47,546	37,683	28,295	20,965	28,362	[1]	21,276	13,703	54,776
Total stockholders' equity	54,551	44,181	34,544	26,222	32,820	[1]	26,935	19,523	61,014	65,178	[1]	48,740
Total liabilities and stockholders' equity	$ 496,777	$ 527,865	495,029	493,858	452,401	[1]	411,011	375,794	337,115
As Previously Reported [Member]
Current assets:
Cash and cash equivalents			4,439	15,205	11,544		51,985	47,869	66,268	93,557		45,747
Marketable securities			0	21,670	29,957		34,760	32,033	31,013
Trade accounts receivable, net			137,862	130,376	102,627		129,761	104,008	95,956
Income taxes receivable			8,737	13,586	11,421		12,553	0	1,596
Prepaid expenses and other			5,689	6,658	3,813		4,966	5,283	4,621
Restricted certificates of deposit			26,015	0
Restricted marketable securities and workers' compensation deposits			21,343	12,533	3,776		0	0	0
Deferred income taxes			15,774	15,763	15,791		17,229	8,944	8,936
Total current assets			219,859	215,791	178,929		251,254	198,137	208,390
Marketable securities			6,048	6,034	20,930		15,984	10,597	6,680
Property, equipment and software, net			22,648	22,648	22,675		22,576	21,786	21,779
Restricted certificates of deposit			88,320	114,335	114,335		20,943	20,943	12,789
Restricted marketable securities and workers' compensation deposits			101,828	78,516	58,533		43,821	34,696	31,133
Other assets			4,840	4,960	5,306		3,836	3,979	4,028
Goodwill			47,820	47,820	47,820		47,820	47,820	47,820
Total assets			491,363	490,104	448,528		406,234	337,958	332,619
Current liabilities:
Line of credit			3,223	5,772
Current portion of long-term debt			27,220	25,220	25,220		220	220	220
Accounts payable			2,419	3,500	2,719		2,839	2,435	2,382
Accrued payroll, payroll taxes and related benefits			141,278	150,102	115,820		129,188	103,564	109,870
Income taxes payable			0	0	0		0	2,322	0
Other accrued liabilities			4,845	6,190	6,230		5,440	3,227	2,541
Workers' compensation claims liabilities			60,457	56,480	54,049		48,127	39,069	38,306
Safety incentives liability			18,147	15,499	14,232		14,063	12,718	12,192
Total current liabilities			257,589	262,763	218,270		199,877	163,555	165,511
Long-term workers' compensation claims liabilities			169,154	165,785	161,933		160,216	83,437	81,829
Long-term debt			14,723	19,778	19,833		4,888	4,943	4,998
Deferred income taxes			8,159	8,159	8,159		4,973	10,392	10,392
Customer deposits and other long-term liabilities			1,487	1,534	1,675		1,888	1,967	1,799
Total liabilities			$ 451,112	$ 458,019	$ 409,870		$ 371,842	$ 264,294	$ 264,529
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value			$ 72	$ 71	$ 71		$ 72	$ 72	$ 72
Additional paid-in capital			6,173	5,165	4,410		5,605	5,798	6,203
Accumulated other comprehensive income (loss)			4	21	(23)		(18)	(50)	(37)
Retained earnings			34,002	26,828	34,200		28,733	67,844	61,852
Total stockholders' equity			40,251	32,085	38,658		34,392	73,664	68,090			53,896
Total liabilities and stockholders' equity			491,363	490,104	448,528		406,234	337,958	332,619
Prior Period Adjustments [Member]
Current assets:
Cash and cash equivalents			0	0	0		0	0	0	$ 0		0
Marketable securities			0	0	0		0	0	0
Trade accounts receivable, net			0	0	0		0	0	0
Income taxes receivable			457	545	526		1,743	34,803	1,463
Prepaid expenses and other			0	0	0		0	0	0
Restricted certificates of deposit			0	0
Restricted marketable securities and workers' compensation deposits			0	0	0		0	0	0
Deferred income taxes			3,209	3,209	3,347		3,034	3,033	3,033
Total current assets			3,666	3,754	3,873		4,777	37,836	4,496
Marketable securities			0	0	0		0	0	0
Property, equipment and software, net			0	0	0		0	0	0
Restricted certificates of deposit			0	0	0		0	0	0
Restricted marketable securities and workers' compensation deposits			0	0	0		0	0	0
Other assets			0	0	0		0	0	0
Goodwill			0	0	0		0	0	0
Total assets			3,666	3,754	3,873		4,777	37,836	4,496
Current liabilities:
Line of credit			0	0
Current portion of long-term debt			0	0	0		0	0	0
Accounts payable			0	0	0		0	0	0
Accrued payroll, payroll taxes and related benefits			(522)	(103)	17		76	519	2,799
Income taxes payable					0		0	(2,322)	0
Other accrued liabilities			0	0	0		0	0	0
Workers' compensation claims liabilities			4,931	5,350	7,015		9,890	14,971	6,077
Safety incentives liability			0	0	0		0	0	0
Total current liabilities			4,409	5,247	7,032		9,966	13,168	8,876
Long-term workers' compensation claims liabilities			4,702	4,108	2,281		2,268	78,809	2,696
Long-term debt			0	0	0		0	0	0
Deferred income taxes			262	262	398		0	0	0
Customer deposits and other long-term liabilities			0	0	0		0	0	0
Total liabilities			$ 9,373	$ 9,617	$ 9,711		$ 12,234	$ 91,977	$ 11,572
Commitments and contingencies
Stockholders' equity:
Common stock, $.01 par value			$ 0	$ 0	$ 0		$ 0	$ 0	$ 0
Additional paid-in capital			0	0	0		0	0	0
Accumulated other comprehensive income (loss)			0	0	0		0	0	0
Retained earnings			(5,707)	(5,863)	(5,838)		(7,457)	(54,141)	(7,076)
Total stockholders' equity			(5,707)	(5,863)	(5,838)		(7,457)	(54,141)	(7,076)			$ (5,156)	[1]
Total liabilities and stockholders' equity			$ 3,666	$ 3,754	$ 3,873		$ 4,777	$ 37,836	$ 4,496
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements

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