Segment Disclosures - Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 180,885	$ 172,229	$ 389,793	$ 373,418
Operating expenses	162,307	151,091	328,494	310,480
Gross margin	18,578	21,138	61,299	62,938
Corporate general & admin	8,306	7,649	18,565	17,633
Operating income (loss)	10,272	13,489	42,734	45,305
Other income (expense):
Interest expense	(3,577)	(4,145)	(7,010)	(8,201)
Gain on sale of operations, net	68	48	76	66
Other (expense) income, net	3,936	515	5,911	2,243
Total other (expense) income	427	(3,582)	(1,023)	(5,892)
Income (loss) from continuing operations before income tax expense	10,699	9,907	41,711	39,413
Financial Services [Member]
Segment Reporting Information [Line Items]
Revenue	119,082	113,527	264,502	254,452
Operating expenses	104,591	98,721	214,613	203,603
Gross margin	14,491	14,806	49,889	50,849
Operating income (loss)	14,491	14,806	49,889	50,849
Other income (expense):
Other (expense) income, net	(58)	339	41	376
Total other (expense) income	(58)	339	41	376
Income (loss) from continuing operations before income tax expense	14,433	15,145	49,930	51,225
Employee Services [Member]
Segment Reporting Information [Line Items]
Revenue	54,479	51,488	110,588	104,266
Operating expenses	45,936	42,868	91,671	85,490
Gross margin	8,543	8,620	18,917	18,776
Operating income (loss)	8,543	8,620	18,917	18,776
Other income (expense):
Interest expense	(8)		(16)	(8)
Gain on sale of operations, net
Other (expense) income, net	89	74	375	175
Total other (expense) income	81	74	359	167
Income (loss) from continuing operations before income tax expense	8,624	8,694	19,276	18,943
National Practices [Member]
Segment Reporting Information [Line Items]
Revenue	7,324	7,214	14,703	14,700
Operating expenses	6,685	6,875	13,318	13,825
Gross margin	639	339	1,385	875
Operating income (loss)	639	339	1,385	875
Other income (expense):
Income (loss) from continuing operations before income tax expense	639	339	1,385	875
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating expenses	5,095	2,627	8,892	7,562
Gross margin	(5,095)	(2,627)	(8,892)	(7,562)
Corporate general & admin	8,306	7,649	18,565	17,633
Operating income (loss)	(13,401)	(10,276)	(27,457)	(25,195)
Other income (expense):
Interest expense	(3,569)	(4,145)	(6,994)	(8,193)
Gain on sale of operations, net	68	48	76	66
Other (expense) income, net	3,905	102	5,495	1,692
Total other (expense) income	404	(3,995)	(1,423)	(6,435)
Income (loss) from continuing operations before income tax expense	$ (12,997)	$ (14,271)	$ (28,880)	$ (31,630)