Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 363,262	$ 282,719	$ 1,116,936	$ 862,097
Operating expenses (income)	306,017	238,328	886,052	699,233
Gross margin	57,245	44,391	230,884	162,864
Corporate general and administrative expenses	15,893	13,035	43,128	41,334
Legal settlement, net	0	0	0	30,468
Operating income	41,352	31,356	187,756	91,062
Other income (expense):
Interest expense	(2,305)	(1,016)	(5,209)	(2,852)
Gain on sale of operations, net	176	0	311	6,385
Other income (expense), net	(2,618)	(1,133)	(24,919)	12,029
Total other (expense) income, net	(4,747)	(2,149)	(29,817)	15,562
Income from continuing operations before income tax expense	36,605	29,207	157,939	106,624
Financial Services
Segment Reporting Information [Line Items]
Revenue	259,998	187,232	808,052	577,970
Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	92,067	85,797	276,261	255,656
National Practices
Segment Reporting Information [Line Items]
Revenue	11,197	9,690	32,623	28,471
Operating segments | Financial Services
Segment Reporting Information [Line Items]
Revenue	259,998	187,232	808,052	577,970
Operating expenses (income)	220,337	156,178	639,780	448,844
Gross margin	39,661	31,054	168,272	129,126
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net				0
Operating income	39,661	31,054	168,272	129,126
Other income (expense):
Interest expense	0	0	0	0
Gain on sale of operations, net	176		311	0
Other income (expense), net	103	18	274	310
Total other (expense) income, net	279	18	585	310
Income from continuing operations before income tax expense	39,940	31,072	168,857	129,436
Operating segments | Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	92,067	85,797	276,261	255,656
Operating expenses (income)	73,321	69,039	220,998	203,748
Gross margin	18,746	16,758	55,263	51,908
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net				0
Operating income	18,746	16,758	55,263	51,908
Other income (expense):
Interest expense	(4)	0	(5)	0
Gain on sale of operations, net	0		0	6,385
Other income (expense), net	2,402	(9)	2,366	863
Total other (expense) income, net	2,398	(9)	2,361	7,248
Income from continuing operations before income tax expense	21,144	16,749	57,624	59,156
Operating segments | National Practices
Segment Reporting Information [Line Items]
Revenue	11,197	9,690	32,623	28,471
Operating expenses (income)	9,743	8,514	29,218	25,542
Gross margin	1,454	1,176	3,405	2,929
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net				0
Operating income	1,454	1,176	3,405	2,929
Other income (expense):
Interest expense	0	0	0	0
Gain on sale of operations, net	0		0	0
Other income (expense), net	8	1	9	1
Total other (expense) income, net	8	1	9	1
Income from continuing operations before income tax expense	1,462	1,177	3,414	2,930
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operating expenses (income)	2,616	4,597	(3,944)	21,099
Gross margin	(2,616)	(4,597)	3,944	(21,099)
Corporate general and administrative expenses	15,893	13,035	43,128	41,334
Legal settlement, net				30,468
Operating income	(18,509)	(17,632)	(39,184)	(92,901)
Other income (expense):
Interest expense	(2,301)	(1,016)	(5,204)	(2,852)
Gain on sale of operations, net	0		0	0
Other income (expense), net	(5,131)	(1,143)	(27,568)	10,855
Total other (expense) income, net	(7,432)	(2,159)	(32,772)	8,003
Income from continuing operations before income tax expense	$ (25,941)	$ (19,791)	$ (71,956)	$ (84,898)