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Derivatives - Schedule of Balance Sheet Classification and Fair Value of Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other assets    
Derivative [Line Items]    
Other assets $ 7,300 $ 42,324
Other liabilities    
Derivative [Line Items]    
Other liabilities $ 30,894 $ 2,131