Summaries of Warrants and Related Information for the Current Quarter (Detail) (Warrant, USD $)	9 Months Ended
Sep. 30, 2011
Warrant
Warrants
Beginning Balance	253,900
Granted
Canceled
Exercised	(3,600)
Expired/Forfeited
Ending Balance	250,300
Exercisable at September 30, 2011	250,300
Weighted-Average Exercise Price
Beginning Balance	$ 17.01
Granted
Canceled
Exercised	$ 8.72
Expired/Forfeited
Ending Balance	$ 17.13
Exercisable at September 30, 2011	$ 17.13

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price [Abstract]

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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