Segment Reporting and Revenue - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 471,315	$ 213,665	$ 739,634	$ 404,660
Cost of revenue	345,179	167,626	571,140	345,742
Gross profit	126,136	46,039	168,494	58,918
Operating expenses	156,453	50,465	233,323	120,774
Interest income	135	437	293	1,540
Interest expense	(2,813)	(2,665)	(4,151)	(5,109)
Income tax benefit	5,052	0	5,052	0
Other income (expense), net	65	43	(27)	(1,303)
Net loss	(27,878)	(6,611)	(63,662)	(66,728)
Real estate segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	88,074	46,250	128,466	61,324
Properties segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	5,025	(1,164)	6,620	(1,365)
Real estate and properties segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expenses	107,788	50,465	184,658	120,774
Rentals segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	34,978	0	34,978	0
Operating expenses	48,665	0	48,665	0
Operating Segments | Real estate segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost of revenue	164,125	88,799	292,342	182,361
Operating Segments | Properties segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	172,445	72,184	265,171	151,282
Cost of revenue	167,420	73,348	258,551	152,647
Operating Segments | Rentals segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	42,548	0	42,548	0
Cost of revenue	7,570	0	7,570	0
Other revenue
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	8,521	7,246	17,878	11,496
Cost of revenue	10,462	6,293	19,448	12,537
Gross profit	(1,941)	953	(1,570)	(1,041)
Intercompany eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	(4,398)	(814)	(6,771)	(1,803)
Cost of revenue	(4,398)	(814)	(6,771)	(1,803)
Brokerage revenue | Operating Segments | Real estate segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	237,511	128,543	393,957	230,894
Partner revenue | Operating Segments | Real estate segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 14,688	$ 6,506	$ 26,851	$ 12,791