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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, 2017
Dec. 31, 2016
Other Assets [Member]    
Derivative [Line Items]    
Other assets $ 23,510 $ 23,844
Other Liabilities [Member]    
Derivative [Line Items]    
Other liabilities $ (2,019) $ (2,447)