Derivative Instruments - Effect of Interest Rate Swaps on Consolidated Statements of Comprehensive Income Loss (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effect of Derivatives on Statement of Operations and Comprehensive Income:
Realized gains (losses) on interest rate swaps	[1],[2]	$ (624,495)	$ (825,360)	$ (908,294)
Realized gain (losses) on termination of interest rate swaps		(226,462)	(779,333)	(101,862)
Unrealized gains (losses) on interest rate swaps		$ (124,869)	$ (948,755)	$ 2,002,200

[1] Consists of interest expense on interest rate swaps.

[2] Interest expense related to interest rate swaps is recorded in realized gains (losses) on interest rate swaps on the Consolidated Statements of Operations and Comprehensive Income (Loss).