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Income Tax - Components of Provision for Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]      
Current $ 1,652 $ 2,297 $ 1,340
Deferred (1,027) (1,516) 330
Income tax expense $ 625 $ 781 $ 1,670