Segment Disclosures - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 211,110	$ 238,389	$ 236,943	$ 277,455	$ 203,138	$ 239,790	$ 235,498	$ 269,998	$ 963,897	$ 948,424	$ 922,003
Operating expenses	211,748	204,760	209,016	199,827	200,706	209,146	198,148	215,496	825,351	823,496	790,283
Gross margin	(638)	33,629	27,927	77,628	2,432	30,644	37,350	54,502	138,546	124,928	131,720
Corporate general and administrative expenses	13,078	11,339	11,160	10,489	10,490	11,670	10,566	11,680	46,066	44,406	39,173
Operating income	(13,716)	22,290	16,767	67,139	(8,058)	18,974	26,784	42,822	92,480	80,522	92,547
Other (expense) income:
Interest expense	(816)	(974)	(2,074)	(1,119)	(1,256)	(1,521)	(1,587)	(1,401)	(4,983)	(5,765)	(6,645)
(Loss) gain on sale of operations, net	(587)	(74)	57	95	15	(145)	50	497	(509)	417	1,025
Other income, net	13,050	5,914	13,336	(15,800)	4,999	6,767	(3,311)	9,260	16,500	17,715	(7,087)
Total other income (expense), net	11,647	4,866	11,319	(16,824)	3,758	5,101	(4,848)	8,356	11,008	12,367	(12,707)
Income from continuing operations before income tax expense	$ (2,069)	$ 27,156	$ 28,086	$ 50,315	$ (4,300)	$ 24,075	$ 21,936	$ 51,178	103,488	92,889	79,840
Financial Services
Segment Reporting Information [Line Items]
Revenue									629,778	616,567	600,926
Benefits & Insurance
Segment Reporting Information [Line Items]
Revenue									297,758	296,228	288,437
National Practices
Segment Reporting Information [Line Items]
Revenue									36,361	35,629	32,640
Operating Segments | Financial Services
Segment Reporting Information [Line Items]
Revenue									629,778	616,567	600,926
Operating expenses									525,209	515,240	508,653
Gross margin									104,569	101,327	92,273
Corporate general and administrative expenses									0	0	0
Operating income									104,569	101,327	92,273
Other (expense) income:
Interest expense									0	0	0
(Loss) gain on sale of operations, net									(612)	578	0
Other income, net									262	(121)	(263)
Total other income (expense), net									(350)	457	(263)
Income from continuing operations before income tax expense									104,219	101,784	92,010
Operating Segments | Benefits & Insurance
Segment Reporting Information [Line Items]
Revenue									297,758	296,228	288,437
Operating expenses									248,357	246,245	239,646
Gross margin									49,401	49,983	48,791
Corporate general and administrative expenses									0	0	0
Operating income									49,401	49,983	48,791
Other (expense) income:
Interest expense									(34)	(57)	(102)
(Loss) gain on sale of operations, net									103	0	0
Other income, net									196	238	493
Total other income (expense), net									265	181	391
Income from continuing operations before income tax expense									49,666	50,164	49,182
Operating Segments | National Practices
Segment Reporting Information [Line Items]
Revenue									36,361	35,629	32,640
Operating expenses									32,637	32,474	30,003
Gross margin									3,724	3,155	2,637
Corporate general and administrative expenses									0	0	0
Operating income									3,724	3,155	2,637
Other (expense) income:
Interest expense									0	0	0
(Loss) gain on sale of operations, net									0	0	0
Other income, net									1	1	3
Total other income (expense), net									1	1	3
Income from continuing operations before income tax expense									3,725	3,156	2,640
Corporate and Other
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating expenses									19,148	29,537	11,981
Gross margin									(19,148)	(29,537)	(11,981)
Corporate general and administrative expenses									46,066	44,406	39,173
Operating income									(65,214)	(73,943)	(51,154)
Other (expense) income:
Interest expense									(4,949)	(5,708)	(6,543)
(Loss) gain on sale of operations, net									0	(161)	1,025
Other income, net									16,041	17,597	(7,320)
Total other income (expense), net									11,092	11,728	(12,838)
Income from continuing operations before income tax expense									$ (54,122)	$ (62,215)	$ (63,992)