Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Balance at January 1,	$ 1,882	$ (178)
Deferred (losses) gains on cash flow hedges	(303)	307
Reclassified to earnings	(931)	(298)
Balance at March 31,	$ 648	$ (169)