Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 168,839	$ 149,841	$ 542,784	$ 491,603
Operating expenses	150,935	137,204	462,560	422,783
Gross margin	17,904	12,637	80,224	68,820
Corporate general & admin	8,944	7,475	26,577	25,594
Operating income (loss)	8,960	5,162	53,647	43,226
Other income (expense):
Interest expense	(3,815)	(3,576)	(12,016)	(11,198)
Gain on sale of operations, net	6	21	72	2,660
Other income, net	2,371	2,541	4,614	5,022
Total other income (expense)	(1,438)	(1,014)	(7,330)	(3,516)
Income (loss) from continuing operations before income tax expense	7,522	4,148	46,317	39,710
Financial Services [Member]
Segment Reporting Information [Line Items]
Revenue	110,613	95,976	365,591	329,476
Operating expenses	97,653	87,260	302,397	273,623
Gross margin	12,960	8,716	63,194	55,853
Operating income (loss)	12,960	8,716	63,194	55,853
Other income (expense):
Other income, net	74	53	450	149
Total other income (expense)	74	53	450	149
Income (loss) from continuing operations before income tax expense	13,034	8,769	63,644	56,002
Employee Services [Member]
Segment Reporting Information [Line Items]
Revenue	50,414	45,762	154,681	139,430
Operating expenses	42,055	38,592	127,545	116,561
Gross margin	8,359	7,170	27,136	22,869
Operating income (loss)	8,359	7,170	27,136	22,869
Other income (expense):
Interest expense	(6)	(6)	(15)	(18)
Other income, net	63	244	238	437
Total other income (expense)	57	238	223	419
Income (loss) from continuing operations before income tax expense	8,416	7,408	27,359	23,288
National Practices [Member]
Segment Reporting Information [Line Items]
Revenue	7,812	8,103	22,512	22,697
Operating expenses	6,617	6,844	20,442	20,225
Gross margin	1,195	1,259	2,070	2,472
Operating income (loss)	1,195	1,259	2,070	2,472
Other income (expense):
Other income, net		1	1	1
Total other income (expense)		1	1	1
Income (loss) from continuing operations before income tax expense	1,195	1,260	2,071	2,473
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating expenses	4,610	4,508	12,176	12,374
Gross margin	(4,610)	(4,508)	(12,176)	(12,374)
Corporate general & admin	8,944	7,475	26,577	25,594
Operating income (loss)	(13,554)	(11,983)	(38,753)	(37,968)
Other income (expense):
Interest expense	(3,809)	(3,570)	(12,001)	(11,180)
Gain on sale of operations, net	6	21	72	2,660
Other income, net	2,234	2,243	3,925	4,435
Total other income (expense)	(1,569)	(1,306)	(8,004)	(4,085)
Income (loss) from continuing operations before income tax expense	$ (15,123)	$ (13,289)	$ (46,757)	$ (42,053)