Segment Reporting and Revenue - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 1,922,765	$ 886,093	$ 779,796
Cost of revenue	1,518,945	653,983	635,693
Gross profit	403,820	232,110	144,103
Operating expenses	513,773	231,318	223,349
Interest income	635	2,074	7,146
Interest expense	(11,762)	(19,495)	(8,928)
Income tax benefit	6,107	0	0
Other income (expense), net	5,360	(1,898)	223
Net loss	(109,613)	(18,527)	(80,805)
Real Estate Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	300,014	234,068	150,390
Properties
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	10,601	(4,696)	(4,682)
Rentals
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	100,138	0	0
Operating expenses	146,504	0	0
Mortgage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	(6,278)	208	(3,881)
Real Estate And Properties Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expenses	367,269	231,318	223,349
Operating Segments | Real Estate Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost of revenue	603,320	417,140	373,150
Operating Segments | Real Estate Segment [Member] | Real estate services (brokerage)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	849,288	607,513	496,480
Operating Segments | Real Estate Segment [Member] | Real estate services (partner)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	54,046	43,695	27,060
Operating Segments | Properties
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	880,653	209,686	240,507
Cost of revenue	870,052	214,382	245,189
Operating Segments | Rentals
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	121,877	0	0
Cost of revenue	21,739	0	0
Operating Segments | Mortgage
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	19,818	15,835	6,097
Cost of revenue	26,096	15,627	9,978
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	13,609	12,377	11,537
Cost of revenue	14,264	9,847	9,261
Gross profit	(655)	2,530	2,276
Intercompany eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(16,526)	(3,013)	(1,885)
Cost of revenue	$ (16,526)	$ (3,013)	$ (1,885)