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Stock-Based Compensation - Summary of Changes in Unvested Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value, Granted	$ 0.00	$ 0.00	$ 5.31
Unvested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Beginning balance	64,503
Number of Options, Granted
Number of Options, Vested	(45,564)
Number of Options, Cancelled	(473)
Number of Options, Ending balance	18,466
Weighted-Average Grant Date Fair Value, Beginning balance	$ 8.67
Weighted-Average Grant Date Fair Value, Granted
Weighted-Average Grant Date Fair Value, Vested	$ 8.91
Weighted-Average Grant Date Fair Value, Cancelled	$ 7.82
Weighted-Average Grant Date Fair Value, Ending balance	$ 8.11

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Nonvested Number Beginning Balance

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Share Based Compensation Arrangement By Share Based Payment Award Option Equity Instruments Forfeitures

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Share based compensation arrangement by share based payment award options cancelled in period weighted average grant date fair value.

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Share based compensation arrangement by share based payment award options vested in period weighted average grant date fair value.

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Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Grant Date Fair Values

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)

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

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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 options vested.

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