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Long-term Debt - Schedule of Net Carrying Amount of Liability Component (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Feb. 28, 2021	Dec. 31, 2020
Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,700,000
Unamortized Issuance Costs	(36,346)
Net Carrying Value	1,663,654
Fair Value	1,956,166
Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Aggregate principal amount			$ 650,000
Convertible Senior Notes due 2025 \| Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount	650,000
Unamortized Issuance Costs	(13,608)
Net Carrying Value	636,392
Fair Value	1,163,416
Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,050,000
Convertible Senior Notes due 2027 \| Convertible Debt
Debt Instrument [Line Items]
Aggregate principal amount	1,050,000
Unamortized Issuance Costs	(22,738)
Net Carrying Value	1,027,262
Fair Value	792,750
Secured Notes Due Twenty Twenty Eight
Debt Instrument [Line Items]
Aggregate principal amount	500,000
Unamortized Issuance Costs	(12,727)
Fair Value	501,440
Net Carrying	$ 487,273