Schedule I: Condensed Financial Information of Registrant - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 67,854	$ 9,763	$ 27,820
Adjustments to reconcile net income to net cash provided by operating activities:
Equity-based compensation	12,994	10,116	13,044
Deferred tax expense (benefit)	(361)	3,323	(2,293)
Tax receivable liability adjustment	(1,590)	(87)	(152)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	3,700	12,273	(5,824)
Income taxes payable	15,585	(209)	(3,618)
Accrued expenses and other liabilities	63,586	7,902	(6,356)
Net cash provided by operating activities	87,362	108,739	90,765
Financing Activities
Net cash used in financing activities	(28,628)	(63,338)	(28,340)
Net increase in cash and cash equivalents	31,302	27,026	11,743
Cash and cash equivalents at beginning of period	52,255	25,229	13,486
Cash and cash equivalents at end of period	83,557	52,255	25,229
Supplemental Cash Flow Information
Income tax payments	1,462	4,167	14,125
Establishment of liabilities under tax receivable agreement	20,691	1,000	59,045
Issuance of equity instruments for acquisitions	0	0	2,221
Parent Company
Operating Activities
Net income	43,900	3,961	11,725
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in net income of subsidiaries	(72,916)	(13,674)	(24,525)
Equity-based compensation	12,994	10,007	10,827
Deferred tax expense (benefit)	(203)	2,792	(2,518)
Tax receivable liability adjustment	1,590	87	152
Changes in operating assets and liabilities:
Income tax receivable	294	3,521	(3,816)
Due from related parties, net	1,351	26,007	(19,182)
Prepaid expenses and other assets	0	0	(2,336)
Income taxes payable	14,684	0	(3,497)
Accrued expenses and other liabilities	(571)	304	1,985
Net cash provided by operating activities	1,123	33,005	(31,185)
Financing Activities
Tax distribution received from FAH, LLC	24,173	5,825	29,502
Tax receivable agreement payments	(1,715)	(4,639)	(173)
Proceeds from exercise of equity-based options	3,794	41	2,148
Net cash used in financing activities	26,252	1,227	31,477
Net increase in cash and cash equivalents	27,375	34,232	292
Cash and cash equivalents at beginning of period	34,568	336	44
Cash and cash equivalents at end of period	61,943	34,568	336
Supplemental Cash Flow Information
Income tax payments	23	2,116	11,969
Establishment of liabilities under tax receivable agreement	20,691	1,000	59,045
Issuance of equity instruments for acquisitions	$ 0	$ 0	$ 2,221