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Convertible Senior Notes - Schedule of Net Carrying Amount of Liability Component (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Feb. 28, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,700,000
Unamortized Issuance Costs	(38,086)
Net Carrying Amount	1,661,914		$ 486,366
Fair Value	2,136,633
Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Aggregate principal amount	650,000		$ 650,000
Unamortized Issuance Costs	(14,349)
Net Carrying Amount	635,651
Fair Value	1,258,654
Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Aggregate principal amount	1,050,000	$ 1,050,000
Unamortized Issuance Costs	(23,737)
Net Carrying Amount	1,026,263
Fair Value	$ 877,979

X

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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- Definition

Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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