Summary of Option Activity (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2013 Long Term Incentive Plan, Two Thousand Nine and Nineteen Ninety Nine
Number of stock options
Outstanding at January 1, 2013		1,406,450
Granted		527,500
Exercised	0	(160,470)
Cancelled or forfeited		(111,030)
Outstanding at December 31, 2013		1,662,450
Exercisable at December 31, 2013		912,390
Weighted Average Exercise Price
Outstanding at January 1, 2013		$ 5.61
Granted		$ 5.30
Exercised		$ 4.84
Cancelled or forfeited		$ 4.63
Outstanding at December 31, 2013		$ 5.65
Exercisable at December 31, 2013		$ 5.84
Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2013		5 years 2 months 12 days
Exercisable at December 31, 2013		2 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding at December 31, 2013		$ 2,049,536
Exercisable at December 31, 2013		$ 1,104,611

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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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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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