Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Balance at January 1,	$ (178)	$ 3,282
Deferred (losses) gains on cash flow hedges	1,509	2,292
Reclassified to earnings	551	(5,752)
Balance at December 31,	$ 1,882	$ (178)