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Long-term Debt - Schedule of Net Carrying Amount of Long-term Debt (Detail) $ in Thousands	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
Total	$ 2,153,034
Convertible Senior Notes due 2025 \| Convertible Debt
Debt Instrument [Line Items]
Total	637,136
Convertible Senior Notes due 2027 \| Convertible Debt
Debt Instrument [Line Items]
Total	1,028,262
Secured Notes Due Twenty Twenty Eight
Debt Instrument [Line Items]
Total	$ 487,636

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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