Convertible Senior Notes - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	May 31, 2017 USD ($) $ / shares	Dec. 31, 2021 USD ($) d $ / shares shares	Dec. 31, 2020 USD ($)	Feb. 11, 2022 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of notes				$ 450,123,000
Loss on early extinguishment of debt			$ (4,892,000)	(10,507,000)
0.375% Convertible Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Principal amount of long term debt			$ 900,000
Debt instrument, interest rate, stated percentage	0.375%
Debt instrument, maturity date			Jun. 01, 2025
Debt instrument, payment terms			The interest rate is fixed at 0.375% per annum and is payable semi-annually in arrears on June 1 and December 1 of each year.
Proceeds from issuance of notes	$ 450,100,000
Principal amount of each convertible note	$ 1,000,000,000
Debt instrument, conversion ratio	3.5396
Debt instrument, conversion price per share | $ / shares	$ 282.52		$ 282.52
Principal amount settlement, Description			The Company expects to settle the principal amount of the 2025 Notes in cash.
Debt instrument, convertible, threshold trading days | d			20
Debt instrument, convertible, threshold consecutive trading days | d			30
Carrying amount of equity component	$ 98,700,000
Debt instrument, effective interest rate	5.71%
Debt issuance costs	$ 9,900,000
Long-term debt, current			$ 700,000
0.375% Convertible Senior Notes Due 2025 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount of long term debt					$ 0
0.375% Convertible Senior Notes Due 2025 [Member] | Capped Call Options [Member]
Debt Instrument [Line Items]
Cost of purchased capped call options	$ 50,600,000
Derivative, price risk option strike price | $ / shares	$ 282.52
Derivative, cap price | $ / shares	$ 426.44
0.375% Convertible Senior Notes Due 2025 [Member] | Liability Component [Member]
Debt Instrument [Line Items]
Debt issuance costs	$ 7,800,000
0.375% Convertible Senior Notes Due 2025 [Member] | Equity Component [Member]
Debt Instrument [Line Items]
Debt issuance costs	$ 2,100,000
0.375% Convertible Senior Notes Due 2025 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of closing price to trigger debt conversion			130.00%
0.375% Convertible Senior Notes Due 2025 [Member] | Maximum [Member] | Capped Call Options [Member]
Debt Instrument [Line Items]
Common stock shares covered under capped call transactions | shares	1,600,000
0.375% Convertible Senior Notes Due 2025 [Member] | Private Offering [Member]
Debt Instrument [Line Items]
Principal amount of long term debt	$ 400,000,000
0.375% Convertible Senior Notes Due 2025 [Member] | Over-Allotment Options [Member]
Debt Instrument [Line Items]
Principal amount of long term debt	60,000,000
0.25% Convertible Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Principal amount of long term debt		$ 1,000,000,000	$ 106,500,000
Debt instrument, interest rate, stated percentage		0.25%
Debt instrument, maturity date			Jun. 01, 2022
Debt instrument, payment terms			The interest rate is fixed at 0.25% per annum and is payable semi-annually in arrears on June 1 and December 1 of each year.
Proceeds from issuance of notes		$ 389,200,000
Debt instrument, conversion ratio		10.5519
Debt instrument, conversion price per share | $ / shares		$ 94.77
Principal amount settlement, Description			The Company expects to settle the principal amount of the 2022 Notes in cash.
Debt instrument, convertible, threshold trading days | d			20
Debt instrument, convertible, threshold consecutive trading days | d			30
Debt instrument convertible, principal amount	$ 364,800,000
Debt instrument, effective interest rate	4.90%
Notes hedges expected to settle description			The Convertible Note Hedges will be settled in cash or shares, or any combination thereof, in accordance with the settlement method of the 2022 Notes in excess of the par amount, and are expected to settle concurrently with the conversion of the 2022 Notes.
Number of common shares to be repurchased under convertible note hedge transactions with certain counterparties | shares			4,200,000
Hedging option strike price per common stock | $ / shares			$ 94.77
Cost of convertible note hedge transactions			$ 78,900,000
Warrants expected to settle, description			The Warrants are expected to settle three business days from each trading day commencing on September 1, 2022 and ending on the 79th trading day thereafter.
Settlement period of warrants excess price over strike price			3 days
Warrants expected to settle, commencement date			Sep. 01, 2022
Sales of warrants			$ 58,900,000
Proceeds From Debt Net Of Issuance Costs			200,000
Convertible notes hedge and warrant transactions cost net			20,000,000.0
Repurchase of aggregate principal amount	$ 272,100,000
Debt instrument, aggregate purchase price	283,000,000.0
Debt instrument, aggregate consideration	613,500,000
Fair value of debt component of repurchases	$ 248,700,000
Loss on early extinguishment of debt			4,900,000
0.25% Convertible Senior Notes Due 2022 [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Principal amount of long term debt			$ 106,500,000
Warrants holders option to purchase number of shares of company’s common stock | shares			4,200,000
Warrants exercise price per share | $ / shares			$ 115.8
Debt instrument convertible to common stock | shares	1,600,000
Debt instrument convertible to common stock, value per share | $ / shares	$ 207.17
Debt instrument convertible to common stock for cash consideration | shares			900,000
Debt Instrument Convertible to Common Stock for Cash Payment			$ 9,000,000.0
0.25% Convertible Senior Notes Due 2022 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount of long term debt					0
0.25% Convertible Senior Notes Due 2022 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, conversion price per share | $ / shares			$ 115.83
Percentage of closing price to trigger debt conversion			130.00%
0.25% Convertible Senior Notes Due 2022 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, conversion price per share | $ / shares			$ 94.77
0.25% Convertible Senior Notes Due 2022 [Member] | Private Offering [Member]
Debt Instrument [Line Items]
Principal amount of long term debt		$ 350,000,000.0
0.25% Convertible Senior Notes Due 2022 [Member] | Over-Allotment Options [Member]
Debt Instrument [Line Items]
Principal amount of long term debt		$ 50,000,000
2022 Notes Partial Repurchase [Member]
Debt Instrument [Line Items]
Unamortized debt discount	$ 238,200,000
Unamortized issuance costs	238,200,000
Loss on early extinguishment of debt	10,500,000
Adjustments to additional paid in capital, equity component of convertible debt	364,800,000
2022 Notes Convertible Note Hedges [Member]
Debt Instrument [Line Items]
Proceeds from issuance of notes	$ 34,900,000
2022 Notes Convertible Note Hedges [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Debt instrument convertible to common stock | shares			200,000
Debt instrument convertible to common stock for cash consideration | shares	2,900,000
Debt instrument cash consideration for conversion	$ 362,500,000
2022 Notes Convertible Note Hedges [Member] | Warrants [Member]
Debt Instrument [Line Items]
Debt instrument convertible to common stock | shares			1,300,000
Debt instrument convertible to common stock for cash consideration | shares	2,900,000
Debt instrument cash consideration for conversion	$ 327,600,000
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member]
Debt Instrument [Line Items]
Principal amount of long term debt			$ 19,382,000	125,839,000
Debt instrument, conversion price per share | $ / shares			$ 94.77
Debt instrument, convertible, threshold trading days | d			20
Debt instrument, convertible, threshold consecutive trading days | d			30
Percentage of closing price to trigger debt conversion			130.00%
Unamortized debt discount			$ 477,000	10,397,000
Unamortized issuance costs			$ 35,000	777,000
Adjustments to additional paid in capital, equity component of convertible debt				613,000
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Adjustments to additional paid in capital, equity component of convertible debt				$ 2,000
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount of long term debt					$ 0