Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 1,411,979	$ 1,104,925	$ 963,897
Operating expenses	1,188,612	945,635	825,351
Gross margin	223,367	159,290	138,546
Corporate general and administrative expenses	55,023	56,150	46,066
Legal settlement, net	0	30,468	0
Operating income (loss)	168,344	72,672	92,480
Other (expense) income:
Interest expense	(8,039)	(3,868)	(4,983)
(Loss) gain on sale of operations, net	413	5,995	(509)
Other income (expense), net	(19,225)	18,241	16,500
Total other (expense) income, net	(26,851)	20,368	11,008
Income from continuing operations before income tax expense	141,493	93,040	103,488
Financial Services
Segment Reporting Information [Line Items]
Revenue	1,010,068	734,026	629,778
Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	358,007	332,323	297,758
National Practices
Segment Reporting Information [Line Items]
Revenue	43,904	38,576	36,361
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Revenue	1,010,068	734,026	629,778
Operating expenses	850,038	608,238	525,209
Gross margin	160,030	125,788	104,569
Corporate general and administrative expenses	0	0	0
Legal settlement, net		0
Operating income (loss)	160,030	125,788	104,569
Other (expense) income:
Interest expense	0	0	0
(Loss) gain on sale of operations, net	413	(289)	(612)
Other income (expense), net	269	263	262
Total other (expense) income, net	682	(26)	(350)
Income from continuing operations before income tax expense	160,712	125,762	104,219
Operating Segments | Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	358,007	332,323	297,758
Operating expenses	290,387	271,650	248,357
Gross margin	67,620	60,673	49,401
Corporate general and administrative expenses	0	0	0
Legal settlement, net		0
Operating income (loss)	67,620	60,673	49,401
Other (expense) income:
Interest expense	(6)	0	(34)
(Loss) gain on sale of operations, net	0	6,284	103
Other income (expense), net	2,392	827	196
Total other (expense) income, net	2,386	7,111	265
Income from continuing operations before income tax expense	70,006	67,784	49,666
Operating Segments | National Practices
Segment Reporting Information [Line Items]
Revenue	43,904	38,576	36,361
Operating expenses	39,201	34,494	32,637
Gross margin	4,703	4,082	3,724
Corporate general and administrative expenses	0	0	0
Legal settlement, net		0
Operating income (loss)	4,703	4,082	3,724
Other (expense) income:
Interest expense	0	0	0
(Loss) gain on sale of operations, net	0	0	0
Other income (expense), net	10	3	1
Total other (expense) income, net	10	3	1
Income from continuing operations before income tax expense	4,713	4,085	3,725
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	0	0	0
Operating expenses	8,986	31,253	19,148
Gross margin	(8,986)	(31,253)	(19,148)
Corporate general and administrative expenses	55,023	56,150	46,066
Legal settlement, net		30,468
Operating income (loss)	(64,009)	(117,871)	(65,214)
Other (expense) income:
Interest expense	(8,033)	(3,868)	(4,949)
(Loss) gain on sale of operations, net	0	0	0
Other income (expense), net	(21,896)	17,148	16,041
Total other (expense) income, net	(29,929)	13,280	11,092
Income from continuing operations before income tax expense	$ (93,938)	$ (104,591)	$ (54,122)