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Employee Compensation Plans - Summarizes of Company's Non-Vested Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Non-vested beginning of year	50,780
Number of Options, Granted	951	1,590
Number of Options, Vested	(24,841)
Number of Options, Non-vested end of year	26,890	50,780
Weighted average fair value, Non-vested beginning of year	$ 9.49
Weighted average fair value, Granted	$ 6.60	$ 7.67
Weighted average fair value, Vested	$ 7.90
Weighted average fair value, Non-vested end of year	$ 10.86	$ 9.49

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- Definition

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

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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