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Share-based compensation arrangement by share-based payment award, award vesting number of installments.

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Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Target Number Of Shares Expected To Be Issued

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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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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 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 of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Number of share instruments newly issued under a share-based compensation plan.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Stock Incentive Plan - Additional Information (Detail)			1 Months Ended	12 Months Ended
Stock Incentive Plan - Additional Information (Detail)	May 09, 2017 USD ($)	Feb. 19, 2017 USD ($) Installment	Feb. 29, 2016	Dec. 31, 2017 USD ($) Grant $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	May 31, 2017	May 09, 2016 Installment	Feb. 15, 2016 Installment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation cost				$ 8,500,000	$ 11,100,000	$ 8,200,000
Weighted average period over which cost is expected to be recognized				1 year 10 months 24 days
Unrecognized compensation costs associated with stock options				$ 0
Weighted average grant date fair value of stock options granted \| $ / shares						$ 16.72
Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	$ 1,200,000
Annual Base Retainer \| Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of grants fully-vested shares of common stock				50.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value				$ 16,700,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value							$ 5,700,000	$ 5,900,000	$ 4,500,000
Aggregate intrinsic value				$ 23,900,000
Restricted Stock Units (RSUs) \| Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards granted										50.00%
Grant date fair value	$ 1,000,000
Restricted Stock Units (RSUs) \| Non-Executive Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares that have been issued for awards \| shares				9,297
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum common shares that may be issued for awards \| shares				9,585,055
Number of common shares that have been issued for awards \| shares				6,438,452
Stock Incentive Plan \| Non-Executive Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares that have been issued for awards \| shares				29,234
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, grant expiration term						10 years
Employment requisite period following grant date						1 year
Closing price per share \| $ / shares				$ 127.08
Aggregate intrinsic value for stock options outstanding				$ 11,300,000
Aggregate intrinsic value for stock options exercisable				11,300,000
Restricted Stock Units And Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards				$ 14,800,000
LTI Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
Number of grants expected that achieves the performance conditions \| Grant				2
LTI Program \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance shares to be earned			0.00%
LTI Program \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance shares to be earned			200.00%
LTI Program \| Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of performance shares to be earned			50.00%
LTI Program \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards granted			50.00%
Grant date fair value		$ 7,900,000
LTI Program \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards granted			50.00%
Award vesting rights, description				The RSUs granted on February 15, 2016 and May 9, 2016 vest in three approximately equal annual installments beginning on the first anniversary of the grant date, and the RSUs granted on February 19, 2017 will vest in one installment on the third anniversary of the grant date, in each case subject to the grantee’s continued employment with the Company on each vesting date, subject to acceleration of vesting in certain circumstances.
Number of annual instalments \| Installment		1									3	3
Grant date fair value		$ 7,900,000