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Companys Deferred Tax Assets Net of Deferred Tax Liabilities and Valuation Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities    
Deferred tax assets, net of deferred tax liabilities $ 22,910 $ 24,267
Valuation allowance (729) (736)
Deferred tax assets, net of deferred tax liabilities and valuation allowance $ 22,181 $ 23,531