Stock-based Compensation - Summary of Stock Option Activity (Detail) - $ / shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding Opening	11,720,648	11,515,642	13,411,130
Granted	3,818,295	2,198,825	2,024,170
Equity awards assumed	2,480,953
Cancelled/forfeited	(630,844)	(203,586)	(332,327)
Exercised	(2,249,870)	(1,790,233)	(3,587,331)
Number of Shares, Outstanding Closing	15,139,182	11,720,648	11,515,642
Weighted Average Exercise Price, Outstanding Opening	$ 26.24	$ 18.70	$ 12.47
Granted , Weighted Average Exercise Price	67.91	55.74	40.81
Cancelled/forfeited, Weighted Average Exercise Price	50.50	30.51	20.27
Exercised, Weighted Average Exercise Price	15.45	13.47	7.75
Weighted Average Exercise Price, Outstanding closing	41.28	$ 26.24	$ 18.70
Weighted Average Exercise Price, Equity awards assumed	$ 50.27
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	10,395
Equity awards assumed	660,017
Cancelled/forfeited	(69,194)
Vested	(122,492)
Number of Shares, Outstanding Closing	478,726

Share Based Compensation Arrangement By Share Based Payment Award Options Assumed From Acquisition.

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- Definition

Share based compensation arrangement by share based payment award options assumed weighted average exercise price.

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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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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification
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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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- Definition

Number of options vested.

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- Definition

Number of share options (or share units) exercised during the current period.

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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