Derivative Instruments and Hedging Activities - Earnings Effect of Derivative Instruments in Condensed Consolidated Statements of Operations and Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Amounts recognized in earnings related to hedge ineffectiveness	$ 0	$ 0	$ 0	$ 0