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Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Benefit from income taxes $ 5,316us-gaap_IncomeTaxExpenseBenefit $ 1,843us-gaap_IncomeTaxExpenseBenefit