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Derivative Instruments and Hedging Activities - Effect of Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Realized losses relating to:      
Derivative instruments not designated as hedging instruments realized (loss) gain net $ (140,519) $ (131,179) $ (160,451)
Unrealized gains (losses) relating to:      
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 38,319 (100,496) 178,865
Total realized and unrealized (losses) gains on derivative instruments (102,200) (231,675) 18,414
Interest Rate Swap Agreements [Member]      
Realized losses relating to:      
Derivative instruments not designated as hedging instruments realized (loss) gain net (108,036) (125,424) (122,439)
Unrealized gains (losses) relating to:      
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 37,723 (86,045) 182,800
Interest Rate Swaps Terminated [Member]      
Realized losses relating to:      
Derivative instruments not designated as hedging instruments realized (loss) gain net (10,876) (1,319) (35,985)
Foreign currency forward contracts [Member]      
Realized losses relating to:      
Derivative instruments not designated as hedging instruments realized (loss) gain net (21,607) (4,436) (2,027)
Unrealized gains (losses) relating to:      
Derivative instruments not designated as hedging instruments unrealized gain (loss) net (418) (16,926) $ (3,935)
Stock purchase warrants [Member]      
Unrealized gains (losses) relating to:      
Derivative instruments not designated as hedging instruments unrealized gain (loss) net $ 1,014 $ 2,475