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Income Taxes - Provision for Income Taxes and Effective Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]        
(Benefit) provision for income taxes $ (406) $ 86 $ (6,337) $ 809
Effective income tax rate (31.10%) 23.50% (37.70%) 48.30%