Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue	$ 6,394,177	$ 1,866,392	$ 1,544,099
Operating expenses:
Sales and marketing	1,076,235	691,119	728,631
Technology and development	474,396	390,172	350,923
General and administrative	448,773	356,722	366,019
As Reported
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		1,756,395	1,432,021
Operating expenses:
Sales and marketing		672,816	714,128
Technology and development		518,072	477,347
General and administrative		357,122	366,176
Effect of Change
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		109,997	112,078
Operating expenses:
Sales and marketing		18,303	14,503
Technology and development		(127,900)	(126,424)
General and administrative		(400)	(157)
Homes
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue	6,106,944	1,634,755	1,324,464
Homes | As Reported
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		1,621,040	1,315,345
Homes | Effect of Change
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		13,715	9,119
IMT
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue	203,449	193,097	193,885
IMT | As Reported
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		104,091	98,522
IMT | Effect of Change
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		89,006	95,363
Mortgages
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue	$ 83,784	38,540	25,750
Mortgages | As Reported
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		31,264	18,154
Mortgages | Effect of Change
Schedule of Error Corrections and Prior Period Adjustment Restatement [Line Items]
Cost of revenue		$ 7,276	$ 7,596