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Common Stock - Summary of Stock Options Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Optioned Common Shares, Beginning Balance	1,006,991
Number of Optioned Common Shares, Option grants	260,097
Number of Optioned Common Shares, Option expired
Number of Optioned Common Shares, Option exercises	(10,000)	(3,100)
Number of Optioned Common Shares, Options forfeited
Number of Optioned Common Shares, Ending Balance	1,257,088
Weighted Average Exercise Price, Beginning Balance	$ 11.39
Weighted Average Exercise Price, Option grants	$ 11.79
Weighted Average Exercise Price, Option expired
Weighted Average Exercise Price, Option exercises	$ 3.00
Weighted Average Exercise Price, Options forfeited
Weighted Average Exercise Price, Ending Balance	$ 11.47

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(4)

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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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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 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 of the plan that expired.

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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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Number of share options (or share units) exercised during the current period.

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