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Gains and Losses Related to Derivative Financial Instruments Not Designated as Hedging Instruments (Detail) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative $ 350   $ 350  
Foreign exchange contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative   $ 1,468   $ (47)