Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 361,952	$ 278,648	$ 753,674	$ 579,378
Operating expenses (income)	289,736	236,934	580,035	460,905
Gross margin	72,216	41,714	173,639	118,473
Corporate general and administrative expenses	10,926	13,816	27,235	28,299
Legal settlement, net	0	30,468	0	30,468
Operating income (loss)	61,290	(2,570)	146,404	59,706
Other income (expense):
Interest expense	(1,645)	(959)	(2,904)	(1,836)
Gain on sale of operations, net	135	6,385	135	6,385
Other income (expense), net	(15,898)	8,373	(22,301)	13,162
Total other (expense) income, net	(17,408)	13,799	(25,070)	17,711
Income from continuing operations before income tax expense	43,882	11,229	121,334	77,417
Financial Services
Segment Reporting Information [Line Items]
Revenue	259,308	186,589	548,054	390,738
Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	91,708	82,620	184,194	169,859
National Practices
Segment Reporting Information [Line Items]
Revenue	10,936	9,439	21,426	18,781
Operating segments | Financial Services
Segment Reporting Information [Line Items]
Revenue	259,308	186,589	548,054	390,738
Operating expenses (income)	209,643	150,920	419,443	292,666
Gross margin	49,665	35,669	128,611	98,072
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net		0		0
Operating income (loss)	49,665	35,669	128,611	98,072
Other income (expense):
Interest expense	0	0	0	0
Gain on sale of operations, net	135	0	135	0
Other income (expense), net	85	194	171	292
Total other (expense) income, net	220	194	306	292
Income from continuing operations before income tax expense	49,885	35,863	128,917	98,364
Operating segments | Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	91,708	82,620	184,194	169,859
Operating expenses (income)	75,020	67,776	147,677	134,709
Gross margin	16,688	14,844	36,517	35,150
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net		0		0
Operating income (loss)	16,688	14,844	36,517	35,150
Other income (expense):
Interest expense	(1)	0	(1)	0
Gain on sale of operations, net	0	6,385	0	6,385
Other income (expense), net	(12)	698	(36)	872
Total other (expense) income, net	(13)	7,083	(37)	7,257
Income from continuing operations before income tax expense	16,675	21,927	36,480	42,407
Operating segments | National Practices
Segment Reporting Information [Line Items]
Revenue	10,936	9,439	21,426	18,781
Operating expenses (income)	9,899	8,487	19,475	17,028
Gross margin	1,037	952	1,951	1,753
Corporate general and administrative expenses	0	0	0	0
Legal settlement, net		0		0
Operating income (loss)	1,037	952	1,951	1,753
Other income (expense):
Interest expense	0	0	0	0
Gain on sale of operations, net	0	0	0	0
Other income (expense), net	1	0	1	0
Total other (expense) income, net	1	0	1	0
Income from continuing operations before income tax expense	1,038	952	1,952	1,753
Corporate and Other
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operating expenses (income)	(4,826)	9,751	(6,560)	16,502
Gross margin	4,826	(9,751)	6,560	(16,502)
Corporate general and administrative expenses	10,926	13,816	27,235	28,299
Legal settlement, net		30,468		30,468
Operating income (loss)	(6,100)	(54,035)	(20,675)	(75,269)
Other income (expense):
Interest expense	(1,644)	(959)	(2,903)	(1,836)
Gain on sale of operations, net	0	0	0	0
Other income (expense), net	(15,972)	7,481	(22,437)	11,998
Total other (expense) income, net	(17,616)	6,522	(25,340)	10,162
Income from continuing operations before income tax expense	$ (23,716)	$ (47,513)	$ (46,015)	$ (65,107)