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Derivatives - Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Other Assets [Member]    
Derivative [Line Items]    
Other assets - Asset (Liability) Derivatives $ 36 $ 4,996
Other Liabilities [Member]    
Derivative [Line Items]    
Other liabilities - Asset (Liability) Derivatives $ (53,103) $ (6,991)