Derivative Instruments - Effect on Consolidated Results - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Realized gains (losses) on terminations of interest rate swaps	$ (16,143)	$ (60,158)	$ (16,143)	$ (60,616)