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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