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Derivative Instruments - Offsetting Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amounts of recognized assets $ 21 $ 16
Gross amounts offset 0 0
Net amount of assets presented 21 16
Gross amounts of recognized liabilities 91 13
Gross amounts offset 0 0
Net amount of liabilities presented $ 91 $ 13