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Share-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	6,356,000	6,112,000	5,507,000	5,750,000
Number of common stock available for future grant	6,300,000
Tax benefits recognized in the consolidated statements of cash flows	$ 0
Weighted-average fair values of options granted	$ 25.11	$ 21.49	$ 23.24
Weighted average remaining contractual term for options outstanding	6 years 8 months 12 days
Share-based compensation expense	$ 42,522,000	$ 28,464,000	$ 28,392,000
Number of stock options exercisable	4,200,000
Stock options exercisable, weighted average exercise price	$ 21.22
Stock options exercisable, weighted-average remaining contractual term	5 years 8 months 12 days
Stock options exercised in period intrinsic value	$ 61,400,000	13,200,000	43,600,000
Stock options intrinsic value of options outstanding	309,900,000
Stock options intrinsic value of options exercisable	234,900,000
Cash received from stock option exercises	$ 13,900,000	$ 2,400,000	$ 6,300,000
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	588,000	326,000	448,000
Share-based compensation expense	$ 13,900,000	$ 8,300,000	$ 6,000,000
Unrecognized compensation cost	$ 30,000,000
Stock vesting period	2 years 8 months 12 days
Total intrinsic value vested in period	$ 14,900,000	12,200,000	5,700,000
Intrinsic value outstanding	$ 83,800,000
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 expense	$ 28,200,000	$ 18,400,000	$ 13,600,000
Unrecognized compensation cost	$ 44,000,000
Stock vesting period	2 years 8 months 12 days
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period	3 years
Share-based compensation, term	7 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period	4 years
Share-based compensation, term	10 years
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted	0	230,000	50,000
Share-based compensation expense	$ 400,000	$ 1,800,000	$ 8,800,000
Unrecognized compensation cost	7,500,000
Intrinsic value outstanding	$ 16,300,000
Performance-based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period	4 years
Performance-based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period	5 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	410,000	0	120,000
Stock vesting period	4 years		4 years
Stock options outstanding	400,000
Employees | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting period	3 years		3 years
Restricted stock units granted	12,500	0	50,000
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock authorized for issuance					17,000,000
Share Based Compensation Arrangement Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock authorized for issuance	14,100,000
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	$ 0	$ 14,900,000

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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