Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 185,042	$ 177,466	$ 398,908	$ 382,192
Operating expenses	163,117	158,317	333,981	320,255
Gross margin	21,925	19,149	64,927	61,937
Corporate general & admin	6,615	8,306	16,480	18,504
Operating income (loss)	15,310	10,843	48,447	43,433
Other income (expense):
Interest expense	(2,848)	(3,577)	(5,825)	(7,010)
Gain on sale of operations, net	45	68	101	76
Other (expense) income, net	(1,126)	3,936	1,733	5,911
Total other (expense) income	(3,929)	427	(3,991)	(1,023)
Income (loss) from continuing operations before income tax expense	11,381	11,270	44,456	42,410
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Revenue	116,671	115,663	260,503	256,901
Operating expenses	102,345	100,584	210,963	206,346
Gross margin	14,326	15,079	49,540	50,555
Operating income (loss)	14,326	15,079	49,540	50,555
Other income (expense):
Other (expense) income, net	8	(58)	107	41
Total other (expense) income	8	(58)	107	41
Income (loss) from continuing operations before income tax expense	14,334	15,021	49,647	50,596
Operating Segments [Member] | Employee Services [Member]
Segment Reporting Information [Line Items]
Revenue	61,024	54,479	123,675	110,588
Operating expenses	51,242	45,936	102,770	91,671
Gross margin	9,782	8,543	20,905	18,917
Operating income (loss)	9,782	8,543	20,905	18,917
Other income (expense):
Interest expense	(11)	(8)	(20)	(16)
Other (expense) income, net	82	89	199	375
Total other (expense) income	71	81	179	359
Income (loss) from continuing operations before income tax expense	9,853	8,624	21,084	19,276
Operating Segments [Member] | National Practices [Member]
Segment Reporting Information [Line Items]
Revenue	7,347	7,324	14,730	14,703
Operating expenses	6,649	6,683	13,250	13,317
Gross margin	698	641	1,480	1,386
Operating income (loss)	698	641	1,480	1,386
Other income (expense):
Other (expense) income, net	1		1
Total other (expense) income	1		1
Income (loss) from continuing operations before income tax expense	699	641	1,481	1,386
Corporate, Non-Segment [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating expenses	2,881	5,114	6,998	8,921
Gross margin	(2,881)	(5,114)	(6,998)	(8,921)
Corporate general & admin	6,615	8,306	16,480	18,504
Operating income (loss)	(9,496)	(13,420)	(23,478)	(27,425)
Other income (expense):
Interest expense	(2,837)	(3,569)	(5,805)	(6,994)
Gain on sale of operations, net	45	68	101	76
Other (expense) income, net	(1,217)	3,905	1,426	5,495
Total other (expense) income	(4,009)	404	(4,278)	(1,423)
Income (loss) from continuing operations before income tax expense	$ (13,505)	$ (13,016)	$ (27,756)	$ (28,848)