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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Disclosure [Abstract]        
(Benefit) provision for income taxes $ (2,436) $ 547 $ (5,931) $ 723
Effective income tax rate (34.60%) 69.20% (38.20%) 55.30%