Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 282,719	$ 238,389	$ 862,097	$ 752,787
Operating expenses	238,328	204,760	699,233	613,603
Gross margin	44,391	33,629	162,864	139,184
Corporate general and administrative expenses	13,035	11,339	41,334	32,988
Legal settlement, net	0	0	30,468	0
Operating income	31,356	22,290	91,062	106,196
Other income (expense):
Interest expense	(1,016)	(974)	(2,852)	(4,167)
Gain (loss) on sale of operations, net	0	(74)	6,385	78
Other (expense) income, net	(1,133)	5,914	12,029	3,450
Total other (expense) income, net	(2,149)	4,866	15,562	(639)
Income from continuing operations before income tax    expense	29,207	27,156	106,624	105,557
Financial Services
Segment Reporting Information [Line Items]
Revenue	187,232	155,499	577,970	498,359
Benefits & Insurance
Segment Reporting Information [Line Items]
Revenue	85,797	73,881	255,656	227,433
National Practices
Segment Reporting Information [Line Items]
Revenue	9,690	9,009	28,471	26,995
Operating segments | Financial Services
Segment Reporting Information [Line Items]
Revenue	187,232	155,499	577,970	498,359
Operating expenses	156,178	129,922	448,844	395,937
Gross margin	31,054	25,577	129,126	102,422
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net
Operating income	31,054	25,577	129,126	102,422
Other income (expense):
Interest expense	0	0	0	0
Gain (loss) on sale of operations, net		(76)	0	(25)
Other (expense) income, net	18	(14)	310	32
Total other (expense) income, net	18	(90)	310	7
Income from continuing operations before income tax    expense	31,072	25,487	129,436	102,429
Operating segments | Benefits & Insurance
Segment Reporting Information [Line Items]
Revenue	85,797	73,881	255,656	227,433
Operating expenses	69,039	62,013	203,748	188,519
Gross margin	16,758	11,868	51,908	38,914
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net
Operating income	16,758	11,868	51,908	38,914
Other income (expense):
Interest expense	0	(10)	0	(30)
Gain (loss) on sale of operations, net		2	6,385	103
Other (expense) income, net	(9)	(36)	863	190
Total other (expense) income, net	(9)	(44)	7,248	263
Income from continuing operations before income tax    expense	16,749	11,824	59,156	39,177
Operating segments | National Practices
Segment Reporting Information [Line Items]
Revenue	9,690	9,009	28,471	26,995
Operating expenses	8,514	8,070	25,542	24,343
Gross margin	1,176	939	2,929	2,652
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net
Operating income	1,176	939	2,929	2,652
Other income (expense):
Interest expense	0	0	0	0
Gain (loss) on sale of operations, net		0	0	0
Other (expense) income, net	1	0	1	1
Total other (expense) income, net	1	0	1	1
Income from continuing operations before income tax    expense	1,177	939	2,930	2,653
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operating expenses	4,597	4,755	21,099	4,804
Gross margin	(4,597)	(4,755)	(21,099)	(4,804)
Corporate general and administrative expenses	13,035	11,339	41,334	32,988
Legal settlement, net			30,468
Operating income	(17,632)	(16,094)	(92,901)	(37,792)
Other income (expense):
Interest expense	(1,016)	(964)	(2,852)	(4,137)
Gain (loss) on sale of operations, net		0	0	0
Other (expense) income, net	(1,143)	5,964	10,855	3,227
Total other (expense) income, net	(2,159)	5,000	8,003	(910)
Income from continuing operations before income tax    expense	$ (19,791)	$ (11,094)	$ (84,898)	$ (38,702)