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Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]    
Balance at January 1, $ 1,882 $ (178)
Deferred (losses) gains on cash flow hedges (4,801) 1,294
Reclassified to earnings (1,716) (83)
Balance at June 30, $ (4,635) $ 1,033