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Debt - Additional Information (Detail)			1 Months Ended		12 Months Ended
Debt - Additional Information (Detail)	Oct. 15, 2018 USD ($) $ / shares shares	Oct. 15, 2013 USD ($) $ / shares	Oct. 31, 2018 USD ($)	Aug. 31, 2017 USD ($) $ / shares	Dec. 31, 2019 USD ($) d $ / shares $ / Option shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares
Debt Instrument [Line Items]
Carrying value of equity component					$ 870,000,000.0
Debt conversion, principal cash settlement amount					0	$ 374,953,000	$ 26,000
Convertible Notes due in 2024
Debt Instrument [Line Items]
Carrying value of equity component					$ 495,000,000	$ 495,000,000
Debt instrument, aggregate principal amount				$ 495,000,000.0
Debt instrument percentage of face value				98.00%
Debt instrument, interest rate, stated percentage, per annum				0.599%	0.599%	0.599%
Conversion rate of shares				8.0212
Principal amount on conversion rate				$ 1,000,000
Debt instrument, convertible, conversion price, per share \| $ / shares				$ 124.67
Net proceeds from offering debt				$ 481,700,000
Debt issuance costs					$ 3,400,000
Repurchase of note principal amount					100.00%
Debt Instrument, unamortized discount				9,900,000	$ 6,533,000	$ 7,946,000
Offering costs					2,229,000	$ 2,715,000
Convertible Notes due 2018 and due 2020
Debt Instrument [Line Items]
Carrying value of equity component					$ 156,200,000
Debt instrument, aggregate principal amount		$ 750,000,000.0
Debt instrument, convertible, conversion price, per share \| $ / shares					$ 94.15	$ 94.15	$ 94.15
Net proceeds from offering debt		726,200,000
Debt issuance costs					$ 23,800,000
Repurchase of note principal amount					100.00%
Common stock shares covered under capped call transactions \| shares					3,982,988
Strike price \| $ / Option					94.15
Cap price \| $ / Option					121.05
Payment for capped calls transactions					$ 29,800,000
Convertible Notes due 2018 and due 2020 \| Convertible Senior Notes
Debt Instrument [Line Items]
Debt Instrument, unamortized discount					161,300,000
Offering costs					5,100,000
Convertible Notes due 2018
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount		$ 375,000,000.0
Debt instrument, interest rate, stated percentage, per annum		0.75%
Debt instrument, convertible, conversion price, per share \| $ / shares	$ 94.15
Debt conversion, principal cash settlement amount	$ 375,000,000.0
Common stock, shares, issued to converting holders \| shares	190,220
Debt Instrument, conversion price measuring average period	25 days
Common stock shares covered under capped call transactions \| shares	95,127
Convertible Notes due 2020
Debt Instrument [Line Items]
Carrying value of equity component					$ 374,993,000	$ 374,993,000
Debt instrument, aggregate principal amount		$ 375,000,000.0
Debt instrument, interest rate, stated percentage, per annum		150.00%			1.50%	1.50%
Conversion rate of shares	10.6213
Principal amount on conversion rate		$ 1,000		$ 1,000
Debt instrument, convertible, conversion price, per share \| $ / shares		$ 94.15
Debt Instrument, unamortized discount					$ 12,078,000	$ 26,581,000
Common stock trading day \| d					20
Consecutive common stock trading days \| d					30
Debt instrument convertible threshold percentage					130.00%
Number of business day period					5 days
Trading price percentage on reported sale price of common stock					98.00%
Offering costs					$ 1,033,000	$ 2,334,000
2018 Notes
Debt Instrument [Line Items]
Common stock shares covered under capped call transactions, percentage					50.00%
2020 Notes
Debt Instrument [Line Items]
Common stock shares covered under capped call transactions, percentage					50.00%
The 2016 Credit Facility
Debt Instrument [Line Items]
Gain (loss) on extinguishment or termination of debt			$ 0
Maximum borrowing capacity			200,000,000.0
The 2018 Credit Facility
Debt Instrument [Line Items]
To repay early, minimum required amount outstanding with certain other conditions have not been met			$ 100,000,000.0
Maturity date of credit facility, if certain other conditions have not been met			Aug. 01, 2020
Debt issuance costs			$ 1,000,000.0
Outstanding amount					$ 0
The 2018 Credit Facility \| Minimum
Debt Instrument [Line Items]
Percentage of commitment fees payable on undrawn amount			0.15%
The 2018 Credit Facility \| Minimum \| LIBOR Rate
Debt Instrument [Line Items]
Debt instrument interest rate percentage			1.00%
The 2018 Credit Facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Debt instrument interest rate percentage			0.00%
The 2018 Credit Facility \| Maximum
Debt Instrument [Line Items]
Percentage of commitment fees payable on undrawn amount			0.35%
The 2018 Credit Facility \| Maximum \| LIBOR Rate
Debt Instrument [Line Items]
Debt instrument interest rate percentage			1.95%
The 2018 Credit Facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Debt instrument interest rate percentage			0.95%