Share-Based Compensation - Summary of Option Activity Under 2013 Plan (Detail) (Option Activity Under the 2013 Plan [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Option Activity Under the 2013 Plan [Member]
Schedule Of Stock Option Activity [Line Items]
Option outstanding, Shares, Beginning balance	46,888
Option granted, Shares	40,259
Option Exercised, Shares	0
Option forfeited, Shares	(3,000)
Option outstanding, Shares, Ending balance	87,147
Option Exercisable, Shares, Ending balance	14,496
Option outstanding, Weighted Average Exercise Price, Beginning balance	$ 20.27
Option Granted, Weighted Average Exercise Price	$ 22.36
Option Exercised, Weighted Average Exercise Price	$ 0
Option Forfeited, Weighted Average Exercise Price	$ 21.12
Option Outstanding, Weighted Average Exercise Price, Ending balance	$ 21.24
Option Exercisable, Weighted Average Exercise Price, Ending balance	$ 20.23
Option Outstanding, Weighted Average Remaining Contractual Term	8 years 10 months 2 days
Option Exercisable, Weighted Average Remaining Contractual Term	8 years 5 months 16 days
Option outstanding, Aggregate Intrinsic Value	$ 412,000
Option Exercisable, Aggregate Intrinsic Value	$ 85,728

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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