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Share-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 31, 2018	Dec. 31, 2016	May 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted	1,416,000	1,040,000	1,807,000
Stock options outstanding	6,107,000	5,746,000	6,356,000		6,112,000
Number of common stock available for future grant	6,800,000
Weighted-average fair values of stock options granted	$ 41.74	$ 43.42	$ 25.11
Weighted average remaining contractual term for stock options outstanding	6 years 8 months 12 days
Share-based compensation expense	$ 75,262,000	$ 58,068,000	$ 42,522,000
Number of stock options exercisable	4,000,000.0
Stock options exercisable, weighted average exercise price	$ 41.01
Stock options exercisable, weighted-average remaining contractual term	5 years 9 months 18 days
Stock options exercised in period intrinsic value	$ 64,300,000	117,000,000.0	61,400,000
Stock options intrinsic value of options outstanding	335,700,000
Stock options intrinsic value of options exercisable	268,200,000
Cash received from stock option exercises	$ 27,300,000	$ 29,500,000	$ 13,900,000
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, term	3 years
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, term	4 years
Share-based compensation, contractual term	10 years
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units granted	707,000	540,000	588,000
Share-based compensation expense	$ 30,400,000	$ 21,900,000	$ 13,900,000
Unrecognized compensation cost	$ 75,500,000
Stock vesting period	2 years 4 months 24 days
Total intrinsic value vested in period	$ 36,100,000	$ 35,500,000	$ 14,900,000
Intrinsic value outstanding	$ 147,200,000
Restricted stock units outstanding	1,368,000	1,133,000	1,080,000		883,000
Restricted Stock Units (RSUs) | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period	4 years
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, term	10 years
Share-based compensation expense	$ 36,500,000	$ 35,400,000	$ 28,200,000
Unrecognized compensation cost	$ 75,000,000.0
Stock vesting period	2 years 4 months 24 days
Stock Options | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period	3 years
Stock Options | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period	4 years
Performance-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units granted	0	200,000	0
Share-based compensation expense	$ 5,600,000	$ 0	$ 400,000
Unrecognized compensation cost	14,100,000
Intrinsic value outstanding	$ 35,500,000
Restricted stock units outstanding	300,000	300,000
Performance-based RSUs | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period	4 years	4 years
Performance-based RSUs | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period	5 years	5 years
Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted	0	70,000	410,000
Stock vesting period		4 years	4 years
Stock options outstanding	211,000
Employees | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units granted	0	20,000	12,500
RSUs outstanding	211,000
Employees | Restricted Stock Units (RSUs) | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period		3 years	3 years
Employees | Restricted Stock Units (RSUs) | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock vesting period		4 years	4 years
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock authorized for issuance				300,000
Number of shares purchased		0
Issuance of common stock for employee stock purchase plan	78,000
Share-based compensation expense	$ 2,700,000	$ 800,000
ESPP | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Discounted purchase price percentage of common stock authorized for issuance	85.00%
2011 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock authorized for issuance						21,000,000
Share Based Compensation Arrangement Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock authorized for issuance	7,800,000
PRSUs Converted into Common Shares | Performance-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value outstanding			$ 8,800,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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