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Stock-Based Compensation Plans - Summary of Transactions of the Company's Stock Option Plans (Detail) - 6 months ended Jun. 30, 2015 - Stock Options Plan [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Options, Beginning balance	728,640
Exercised, Number of Options	(114,920)
Forfeited, Number of Options	(4,231)
Outstanding, Number of Options, Ending balance	687,756
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 19.55
Exercised, Weighted Average Exercise Price	6.20
Forfeited, Weighted Average Exercise Price	15.32
Outstanding, Weighted Average Exercise Price, Ending balance	$ 20.99
Discount [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Options	54,717
Granted, Weighted Average Exercise Price	$ 0.00
Granted, Weighted Average Grant-Date Fair Value	$ 36.18
Market Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Options	23,550
Granted, Weighted Average Exercise Price	$ 43.95
Granted, Weighted Average Grant-Date Fair Value	$ 9.89

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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.

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

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

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