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Debt - Narrative (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 15, 2020 USD ($) Vote shares | May 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) day | Sep. 30, 2019 USD ($) | Sep. 25, 2020 USD ($) | May 19, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Increased inventory under credit facilities |  |  | $ 193,300,000 |  | $ 193,300,000 |  |  |  | $ 836,600,000
Increased borrowings under credit facilities |  |  | 114,300,000 |  | 114,300,000 |  |  |  | 691,500,000
Gain on partial extinguishment |  |  | 0 | $ 0 | 6,391,000 | $ 0 |  |  |
Class C Capital Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shares received in unwinding of capped call transactions (in shares) | shares | 317,865 | 317,865 |  |  |  |  |  |  |
Value based on trading price of Class C capital stock at time of unwind | $ 14,800,000 | $ 14,800,000 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate Principal Amount |  |  | 2,384,664,000 |  | 2,384,664,000 |  |  |  |
Unamortized Debt Discount and Debt Issuance Costs |  |  | 539,070,000 |  | $ 539,070,000 |  |  |  | 463,348,000
2024 and 2026 Notes | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, threshold consecutive trading days | day |  |  |  |  | 30 |  |  |  |
Debt Instrument, convertible threshold percentage |  |  |  |  | 130.00% |  |  |  |
2.75% convertible senior notes due 2025 | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, convertible threshold trading days | 20 |  |  |  | 20 |  |  |  |
Debt instrument, threshold consecutive trading days | Vote | 30 |  |  |  |  |  |  |  |
Debt Instrument, convertible threshold percentage | 130.00% |  |  |  |  |  |  |  |
Aggregate Principal Amount | $ 500,000,000.0 |  | $ 565,000,000 |  | $ 565,000,000 |  |  | $ 65,000,000.0 |
Stated Interest Rate | 2.75% |  | 2.75% |  | 2.75% |  |  | 2.75% |
Net proceeds from issuance | $ 553,300,000 |  |  |  |  |  |  |  |
Remaining consideration allocated to equity component | $ 154,800,000 |  |  |  |  |  |  |  |
Repurchase price percentage of principal amount | 100.00% |  |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Costs | $ 3,300,000 |  | $ 156,677,000 |  | $ 156,677,000 |  |  |  | 0
2.00% convertible senior notes due 2021 | Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate Principal Amount |  |  | $ 265,330,000 |  | $ 265,330,000 |  |  |  |
Stated Interest Rate |  |  | 2.00% |  | 2.00% |  |  |  |
Repurchased amount |  | 194,700,000 |  |  |  |  |  |  |
Cash paid for repurchase |  | 194,700,000 |  |  |  |  |  |  |
Aggregate purchase price |  | 230,900,000 |  |  |  |  |  |  |
Fair value of liability component |  | 172,900,000 |  |  |  |  |  |  |
Remaining consideration allocated to equity component |  | 58,000,000.0 |  |  |  |  |  |  |
Reduction to long-term debt |  | 179,300,000 |  |  |  |  |  |  |
Reduction to additional paid-in capital |  | 58,000,000.0 |  |  |  |  |  |  |
Gain on partial extinguishment |  | $ 6,400,000 |  |  |  |  |  |  |
Unamortized Debt Discount and Debt Issuance Costs |  |  | $ 16,067,000 |  | $ 16,067,000 |  |  |  | 44,498,000
2.00% convertible senior notes due 2021 | Convertible Debt | Class C Capital Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shares issued in debt conversion | shares |  | 753,936 |  |  |  |  |  |  |
Line of Credit | Mortgages Segment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  | 150,000,000 |  | 150,000,000 |  |  |  |
Comerica Bank | Line of Credit | Mortgages Segment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  | 75,000,000 |  | 75,000,000 |  | $ 75,000,000.0 |  |
Increase to maximum borrowing capacity |  |  |  |  |  |  | $ 25,000,000.0 |  |
Citibank, N.A. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repurchase agreement, committed amount |  |  | 25,000,000.0 |  | 25,000,000.0 |  |  |  |
Citibank, N.A. | Mortgages Segment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  | 58,859,000 |  | 58,859,000 |  |  |  | $ 394,000
Citibank, N.A. | Line of Credit | Mortgages Segment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum Borrowing Capacity |  |  | $ 75,000,000 |  | $ 75,000,000 |  |  |  |

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