Convertible Senior Notes - Additional Information (Detail)			1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 22, 2019 USD ($) shares	Jul. 19, 2019 USD ($) $ / shares	Sep. 23, 2019 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) d	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 16, 2019 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes, net of costs							$ 278,466,000
Notes threshold percentage of stock price trigger				130.00%
Notes threshold trading days | d					20
Debt instrument amount convertible into equity				$ 2,000,000	$ 2,000,000
Notes threshold consecutive trading days | d					30
Amortization of debt discount and issuance costs					$ 11,530,000	$ 10,970,000	7,536,000
Total consideration on conversion							198,757,000
Loss on extinguishment of debt					(13,000)		$ (5,650,000)
0.375% Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Notes due date				$ 287,500,000	$ 287,500,000
Notes, interest rate				0.375%	0.375%
Proceeds from issuance of convertible senior notes, net of costs		$ 278,500,000
Interest repayment terms					Interest is payable semi-annually in arrears on January 15 and July 15 of each year, beginning on January 15, 2020
Notes, due date					Jul. 15, 2024
Debt instrument amount convertible into equity				$ 11,000,000	$ 11,000,000
Notes conversion ratio per $1,000 principal amount		8,674.9000
Notes initial conversion price | $ / shares		$ 115.28
Notes redemption price		100.00%
Contractual coupon interest					1,100,000
Amortization of debt discount and issuance costs					10,100,000
Amortization of the debt issuance costs					$ 1,400
Effective interest rate on the Notes				5.10%	5.10%
Notes, carrying value				$ 255,300,000	$ 255,300,000
Fair value of the note				678,500,000	678,500,000
Additional Notes issued				37,500,000	37,500,000
Discount rate							4.50%
Proceeds allocated to the conversion feature							$ 52,100
Transaction costs attributable to liability component					7,400,000
Transaction costs attributable to equity component				1,600	$ 1,600
Loss On Debt Conversion				$ 13,000,000
2.125% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Notes due date								$ 92,000,000.0
Notes, interest rate				2.125%	2.125%
Repayment Of Senior Debt		$ 92,300,000	$ 23,000.0
Accrued interest		$ 300,000
Total consideration on conversion	$ 253,300
Face amount of remaining convertible debt			60,800,000
Equity component of converted debt	$ 163,600		38,300,000
Loss on extinguishment of debt			$ (1,100,000)				$ (4,600,000)
2.125% Convertible Senior Notes due 2021 | Common Stock [Member]
Debt Instrument [Line Items]
Conversion of Convertible Securities Stock Issued | shares | shares	1,850,155		466,045
Conversion of Convertible Securities Stock Issued | value	$ 161,000,000.0		$ 37,800,000