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Net Income Per Share - Additional Information (Detail) (Employee Stock Option [Member])	6 Months Ended
	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

X

- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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