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Segment Information and Revenue - Depreciation and Amortization Expense and Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization |  |  | $ 81,977 | $ 63,888
Share-based compensation expense |  |  | 145,105 | 151,884
Homes |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization | $ 3,029 | $ 2,331 | 9,201 | 5,384
Share-based compensation expense | 11,815 | 8,025 | 35,847 | 20,666
IMT |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization | 22,074 | 18,362 | 67,889 | 54,264
Share-based compensation expense | 33,435 | 30,687 | 98,940 | 118,101
Mortgages Segment |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization | 1,675 | 1,467 | 4,887 | 4,240
Share-based compensation expense | $ 3,709 | $ 3,416 | $ 10,318 | $ 13,117

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