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Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Balance at January 1, $ 3,282 $ (1,296)
Deferred (losses) gains on cash flow hedges 2,995 292
Reclassified to earnings (2,623) 1,090
Balance at June 30, $ 3,654 $ 86