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Debt - Schedule of Convertible Senior Notes (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Interest Expense | $ 39,430,000 | $ 37,590,000 | $ 78,985,000 | $ 75,182,000 |
Convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal Amount | 2,039,860,000 |  | 2,039,860,000 |  |
Unamortized Debt Discount and Debt Issuance Costs | 433,278,000 |  | 433,278,000 |  | $ 498,227,000
Fair Value | 4,800,618,000 |  | 4,800,618,000 |  | 5,333,849,000
Contractual Coupon Interest | 8,140,000 | 8,259,000 | 16,380,000 | 14,994,000 |
Amortization of Debt Discount | 23,950,000 | 23,859,000 | 48,069,000 | 45,152,000 |
Amortization of Debt Issuance Costs | 1,151,000 | 1,340,000 | 2,303,000 | 2,594,000 |
Interest Expense | 33,241,000 | 33,458,000 | 66,752,000 | 62,740,000 |
Convertible senior notes | 2026 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal Amount | $ 498,800,000 |  | $ 498,800,000 |  |
Stated Interest Rate | 1.375% |  | 1.375% |  |
Effective Interest Rate | 8.10% |  | 8.10% |  |
Unamortized Debt Discount and Debt Issuance Costs | $ 141,269,000 |  | $ 141,269,000 |  | 152,434,000
Fair Value | 1,434,100,000 |  | 1,434,100,000 |  | 1,508,675,000
Contractual Coupon Interest | 1,715,000 | 1,719,000 | 3,432,000 | 3,438,000 |
Amortization of Debt Discount | 5,323,000 | 4,922,000 | 10,549,000 | 9,746,000 |
Amortization of Debt Issuance Costs | 131,000 | 120,000 | 259,000 | 238,000 |
Interest Expense | 7,169,000 | 6,761,000 | 14,240,000 | 13,422,000 |
Convertible senior notes | 2025 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal Amount | $ 565,000,000 |  | $ 565,000,000 |  |
Stated Interest Rate | 2.75% |  | 2.75% |  |
Effective Interest Rate | 10.32% |  | 10.32% |  |
Unamortized Debt Discount and Debt Issuance Costs | $ 136,170,000 |  | $ 136,170,000 |  | 150,112,000
Fair Value | 1,132,718,000 |  | 1,132,718,000 |  | 1,168,855,000
Contractual Coupon Interest | 3,884,000 | 2,007,000 | 7,768,000 | 2,007,000 |
Amortization of Debt Discount | 6,702,000 | 3,148,000 | 13,235,000 | 3,148,000 |
Amortization of Debt Issuance Costs | 358,000 | 168,000 | 707,000 | 168,000 |
Interest Expense | 10,944,000 | 5,323,000 | 21,710,000 | 5,323,000 |
Convertible senior notes | 2024 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal Amount | $ 608,382,000 |  | $ 608,382,000 |  |
Stated Interest Rate | 0.75% |  | 0.75% |  |
Effective Interest Rate | 7.68% |  | 7.68% |  |
Unamortized Debt Discount and Debt Issuance Costs | $ 118,256,000 |  | $ 118,256,000 |  | 148,727,000
Fair Value | 1,665,403,000 |  | 1,665,403,000 |  | 2,023,280,000
Contractual Coupon Interest | 1,143,000 | 1,262,000 | 2,381,000 | 2,510,000 |
Amortization of Debt Discount | 7,917,000 | 8,095,000 | 16,327,000 | 15,956,000 |
Amortization of Debt Issuance Costs | 270,000 | 278,000 | 559,000 | 545,000 |
Interest Expense | 9,330,000 | 9,635,000 | 19,267,000 | 19,011,000 |
Convertible senior notes | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate Principal Amount | $ 367,678,000 |  | $ 367,678,000 |  |
Stated Interest Rate | 1.50% |  | 1.50% |  |
Effective Interest Rate | 6.99% |  | 6.99% |  |
Unamortized Debt Discount and Debt Issuance Costs | $ 37,583,000 |  | $ 37,583,000 |  | 46,954,000
Fair Value | 568,397,000 |  | 568,397,000 |  | $ 633,039,000
Contractual Coupon Interest | 1,398,000 | 1,402,000 | 2,799,000 | 2,804,000 |
Amortization of Debt Discount | 4,008,000 | 3,749,000 | 7,958,000 | 7,446,000 |
Amortization of Debt Issuance Costs | 392,000 | 366,000 | 778,000 | 727,000 |
Interest Expense | 5,798,000 | 5,517,000 | 11,535,000 | 10,977,000 |
Convertible senior notes | 2021 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual Coupon Interest | 0 | 1,803,000 | 0 | 4,103,000 |
Amortization of Debt Discount | 0 | 3,945,000 | 0 | 8,856,000 |
Amortization of Debt Issuance Costs | 0 | 408,000 | 0 | 916,000 |
Interest Expense | 0 | 6,156,000 | 0 | 13,875,000 |
Convertible senior notes | 2020 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual Coupon Interest | 0 | 66,000 | 0 | 132,000 |
Amortization of Debt Discount | 0 | 0 | 0 | 0 |
Amortization of Debt Issuance Costs | 0 | 0 | 0 | 0 |
Interest Expense | $ 0 | $ 66,000 | $ 0 | $ 132,000 |

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