Segment Information - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA		$ 119,677	$ 92,558	$ 103,515
Gain (loss) on sale or disposition of assets, net		(5)	(600)	(342)
Loss on contract settlement		(40,900)
Loss on extinguishment of debt		(264)
Impairment charge - leased assets			(7,902)
Impairment charge - goodwill		(5,123)	0	0
Equity-based compensation expense		(34,298)	(16,267)	(10,934)
Acquisition-related expense		(17,422)	(2,375)	(1,127)
Fair value adjustments to contingent consideration		(309)	(814)	(241)
Other		(1,057)	97
Interest income		217	340	1,446
Interest expense		(11,344)	(9,223)	(12,229)
Depreciation and amortization		(31,333)	(26,106)	(21,792)
Income (loss) before provision for income taxes		(22,161)	29,708	58,296
Real Estate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA		125,247	96,079	106,810
Impairment charge - goodwill	$ 5,100	(5,123)
Mortgage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA		(5,321)	(2,255)	(2,709)
Other.
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated
Adjusted EBITDA		$ (249)	$ (1,266)	$ (586)