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Long-term Debt - Additional Information (Detail)		1 Months Ended		3 Months Ended	9 Months Ended
Long-term Debt - Additional Information (Detail)	Jun. 14, 2021 USD ($)	Feb. 28, 2021 USD ($) d $ / shares	Dec. 31, 2020 USD ($) d $ / shares	Sep. 30, 2021 USD ($) d	Sep. 30, 2021 USD ($) shares
Senior Secured Notes Due Twenty Twenty Eight
Debt Instrument [Line Items]
Aggregate principal amount	$ 500,000,000.0
Interest rate, fixed percentage	6.125%
Periodic payment description					The 2028 Secured Notes bear interest at a fixed rate of 6.125% per annum, payable semiannually in arrears on June 15 and December 15 of each year, beginning on December 15, 2021.
Proceeds from debt	$ 487,200,000
Latest date through which Company may redeem some or all of the 2028 secured notes	Jun. 15, 2024
Debt instrument, redemption description	At any time and from time to time prior to June 15, 2024, the Company may redeem some or all of the 2028 Secured Notes at a redemption price equal to 100% of the principal amount of the 2028 Secured Notes being redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, plus a “make-whole” premium as set forth in the 2028 Secured Notes Indenture. At any time and from time to time on or after June 15, 2024, the Company may redeem some or all of the 2028 Secured Notes at the redemption prices described in the Indenture, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. At any time prior to June 15, 2024, but not more than once during each consecutive twelve-month period, the Company may redeem up to 10% of the aggregate principal amount of the 2028 Secured Notes at a redemption price equal to 103% of the principal amount of the 2028 Secured Notes being redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. At any time prior to June 15, 2024, the Company may redeem, on one or more occasions, up to 40% of the aggregate principal amount of the 2028 Secured Notes with the proceeds of certain equity offerings, at a redemption price equal to 106.125% of the principal amount of the 2028 Secured Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. If the Company experiences a Change of Control or Fundamental Change (each as defined in the 2028 Secured Notes Indenture), the Company may be required to offer to repurchase the 2028 Secured Notes at a purchase price equal to 101% of their principal amount plus accrued and unpaid interest, if any, to, but excluding, the repurchase date. In certain circumstances, the Company must use certain of the proceeds from a sale of assets to make an offer to repurchase 2028 Secured Notes at a purchase price equal to 100% of their principal amount, plus accrued and unpaid interest, if any, to, but excluding, the repurchase date.
Convertible Senior Notes due 2025
Debt Instrument [Line Items]
Aggregate principal amount			$ 650,000,000.0
Interest rate, fixed percentage			0.75%
Periodic payment description			The 2025 Convertible 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 debt			$ 634,700,000
Customary offering expense			$ 15,300,000
Effective interest rate percentage			1.23%
Total Interest Expense				$ 0	$ 2,500,000
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]
Minimum percentage principal amount of holders required to declare the principal of, and accrued and unpaid interest, on Notes is due and payable upon an event of default			25.00%
Convertible Senior Notes due 2025 \| Class A
Debt Instrument [Line Items]
Initial conversion rate			2.5126
Price per share \| $ / shares			$ 1,000
Initial conversion price \| $ / shares			$ 397.99
Number of shares convertible from notes \| shares					1,633,190
Convertible Senior Notes due 2025 \| Class A \| 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
Convertible Senior Notes due 2025 \| Class A \| 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 \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Debt instrument, convertible, earliest date			Apr. 01, 2021
Debt instrument, convertible, trading days \| d			20	20
Debt instrument, convertible, consecutive trading days \| d			30	30
Convertible Senior Notes due 2025 \| Class A \| Minimum
Debt Instrument [Line Items]
Conversion price percentage applicable trading days				130.00%
Convertible Senior Notes due 2025 \| Class A \| 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 \| 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 \| Maximum [Member] \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Conversion price percentage applicable trading days			98.00%
Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,050,000,000.000
Interest rate, fixed percentage		0.00%
Periodic payment description		The 2027 Convertible Notes are senior unsecured obligations of the Company and do not bear regular interest. However, holders of the 2027 Convertible Notes may receive special interest under specified circumstances as outlined in the indenture relating to the issuance of the 2027 Convertible Notes (the “2027 Convertible Notes Indenture”). Any special interest is payable semiannually in arrears on February 15 and August 15 of each year, beginning on August 15, 2021
Payment start date		Aug. 15, 2021
Debt instrument, maturity date		Feb. 15, 2027
Proceeds from debt					$ 1,026,000,000.000
Customary offering expense				$ 24,200,000	$ 24,200,000
Effective interest rate percentage				0.39%	0.39%
Convertible Senior Notes due 2027 \| Fundamental Change
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage of principal amount redeemed		100.00%
Convertible Senior Notes due 2027 \| Events of Default
Debt Instrument [Line Items]
Percentage of principal accrued and unpaid interest		100.00%
Convertible Senior Notes due 2027 \| Minimum
Debt Instrument [Line Items]
Conversion price percentage applicable trading days		130.00%
Convertible Senior Notes due 2027 \| Minimum \| Events of Default
Debt Instrument [Line Items]
Minimum percentage principal amount of holders required to declare the principal of, and accrued and unpaid interest, on Notes is due and payable upon an event of default		25.00%
Convertible Senior Notes due 2027 \| Class A
Debt Instrument [Line Items]
Initial conversion rate		0.6981
Price per share \| $ / shares		$ 1,000
Initial conversion price \| $ / shares		$ 1,432.46
Number of shares convertible from notes \| shares					733,005
Convertible Senior Notes due 2027 \| Class A \| Early Conversion by Noteholders before August 15, 2026
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
Convertible Senior Notes due 2027 \| Class A \| Redeemable by Company after February 20, 2024
Debt Instrument [Line Items]
Debt instrument, convertible, earliest date		Feb. 20, 2024
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 2027 \| Class A \| Early Conversion by Noteholders before June 15, 2025
Debt Instrument [Line Items]
Debt instrument, convertible, earliest date		Jul. 01, 2021
Debt instrument, convertible, trading days \| d		20
Debt instrument, convertible, consecutive trading days \| d		30
Convertible Senior Notes due 2027 \| Class A \| Minimum \| Redeemable by Company after February 20, 2024
Debt Instrument [Line Items]
Conversion price percentage applicable trading days		130.00%
Convertible Senior Notes due 2027 \| Class A \| 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 2027 \| Class A \| Maximum [Member] \| Early Conversion by Noteholders before August 15, 2026
Debt Instrument [Line Items]
Conversion price percentage applicable trading days		98.00%
Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Total Interest Expense				$ 0	$ 0
Secured Notes Due Twenty Twenty Eight
Debt Instrument [Line Items]
Customary offering expense				$ 12,800,000	$ 12,800,000
Effective interest rate percentage				6.58%	6.58%
Total Interest Expense				$ 0	$ 0
Debt instrument springing maturity date 1	Sep. 15, 2025
Debt Instrument Maturity Date	Nov. 16, 2026
Secured Notes Due Twenty Twenty Eight \| Maximum [Member]
Debt Instrument [Line Items]
Springing maturity condition FCCR - aggregate principal of FCCR convertible notes outstanding	$ 100,000,000
Springing maturity condition 1- aggregate principal of 2025 convertible notes outstanding	100,000,000
Springing maturity condition 2- aggregate principal of 2027 convertible notes outstanding	$ 100,000,000
Secured Notes Due Twenty Twenty Eight \| Class A \| Minimum
Debt Instrument [Line Items]
Springing maturity liquidity	130.00%