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Components of Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Current tax provision $ 2,138 $ 1,830 $ 6,691 $ 3,120
Deferred tax benefit (1,056) (472) (1,486) (6,723)
Income tax expense (benefit) $ 1,082 $ 1,358 $ 5,205 $ (3,603)