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Segment Information and Revenue - Depreciation and Amortization Expense and Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization			$ 57,882	$ 55,199
Share-based compensation			152,068	96,146
Homes segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization	$ 4,733	$ 2,597	9,026	6,172
Share-based compensation	20,495	12,728	36,416	24,032
IMT
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization	22,157	22,038	44,956	45,815
Share-based compensation	58,362	35,958	99,754	65,505
Mortgages segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization	2,093	1,538	3,900	3,212
Share-based compensation	$ 9,538	$ 3,665	$ 15,898	$ 6,609

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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