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Income Taxes - Provision (Benefit) for Income Taxes and Effective Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]    
Provision (benefit) for income taxes $ 17 $ (3,495)
Effective income tax rate 0.30% (41.20%)