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Net Income Per Share - Additional Information (Detail) (Employee Stock Option [Member]) | 6 Months Ended
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Jun. 30, 2014
Employee Stock Option [Member] |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
Number of stock options granted | 72,650

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration