Convertible Senior Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
Dec. 31, 2020 USD ($) d $ / shares	Dec. 31, 2020 USD ($) $ / shares
Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Aggregate principal amount	$ 650,000	$ 650,000
Interest rate, fixed percentage	0.75%	0.75%
Additional principal option exercised amount	$ 100,000	$ 100,000
Periodic payment description	The Notes are senior unsecured obligations of the Company and bear interest at a fixed rate of 0.750% per annum, payable semiannually in arrears on June 15 and December 15 of each year, beginning on June 15, 2021
Payment start date	Jun. 15, 2021
Debt instrument, maturity date	Dec. 15, 2025
Proceeds from convertible senior notes	$ 634,700
Convertible Senior Notes due 2025 \| Fundamental Change
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed	100.00%
Convertible Senior Notes due 2025 \| Events of Default
Debt Instrument [Line Items]
Percentage of principal accrued and unpaid interest	100.00%
Convertible Senior Notes due 2025 \| Minimum \| Events of Default
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed	25.00%
Convertible Senior Notes due 2025 \| Class A Common Stock
Debt Instrument [Line Items]
Initial conversion rate	2.5126
Price per share \| $ / shares	$ 1,000	$ 1,000
Initial conversion price \| $ / shares	$ 397.99	397.99
Convertible Senior Notes due 2025 \| Class A Common Stock \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Debt instrument, convertible, earliest date	Mar. 31, 2021
Debt instrument, convertible, trading days \| d	20
Debt instrument, convertible, consecutive trading days \| d	30
Convertible Senior Notes due 2025 \| Class A Common Stock \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Debt instrument, convertible, trading days \| d	5
Debt instrument, convertible, consecutive trading days \| d	5
Trading price per share \| $ / shares	$ 1,000	$ 1,000
Convertible Senior Notes due 2025 \| Class A Common Stock \| Redeemable by Company after December 20, 2023
Debt Instrument [Line Items]
Debt instrument, convertible, earliest date	Dec. 20, 2023
Debt instrument, convertible, trading days \| d	20
Debt instrument, convertible, consecutive trading days \| d	30
Debt instrument, redemption price, percentage of principal amount redeemed	100.00%
Convertible Senior Notes due 2025 \| Class A Common Stock \| Minimum \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Conversion price percentage applicable trading days	130.00%
Convertible Senior Notes due 2025 \| Class A Common Stock \| Minimum \| Redeemable by Company after December 20, 2023
Debt Instrument [Line Items]
Conversion price percentage applicable trading days	130.00%
Convertible Senior Notes due 2025 \| Class A Common Stock \| Maximum \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Conversion price percentage applicable trading days	98.00%
Convertible Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 650,000	$ 650,000
Carrying amount of the equity component after deducting liability component	153,527	153,527
Customary offering expense	$ 15,300	15,300
Debt issuance costs attributed to liability component		11,600
Debt issuance costs attributed to equity component		$ 3,600
Effective interest rate percentage	6.82%	6.82%

Amount of additional principal option exercised by initial purchaser.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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