Derivative Instruments - Effect of Interest Rate Swaps on Consolidated Statements of Comprehensive Income Loss (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Effect of Derivatives on Statement of Operations and Comprehensive Income:
Realized gains (losses) on interest rate swaps	[1],[2]	$ (162,304)	$ (169,083)	$ (465,008)	$ (650,452)
Realized gain (losses) on termination of interest rate swaps				(226,462)	(779,333)
Unrealized gains (losses) on interest rate swaps		$ (822,585)	$ 98,593	$ (587,995)	$ (75,287)

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

[2] Interest expense related to the Company's interest rate swaps is recorded in Realized gains (losses) on interest rate swaps on the Consolidated Statements of Comprehensive Income (Loss).