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Derivative Instruments and Hedging Activities - Effect of Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Realized (losses) gains relating to:        
Derivative instruments not designated as hedging instruments realized (loss) gain net $ (13,886) $ (23,706) $ (46,718) $ (84,641)
Unrealized gains (losses) relating to:        
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 7,758 53,632 3,545 (82,326)
Total realized and unrealized gains (losses) on derivative instruments (6,128) 29,926 (43,173) (166,967)
Interest rate swap agreements        
Realized (losses) gains relating to:        
Derivative instruments not designated as hedging instruments realized (loss) gain net (15,729) (22,219) (48,199) (67,808)
Unrealized gains (losses) relating to:        
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 11,575 47,816 5,181 (96,055)
Interest rate swap agreement terminations        
Realized (losses) gains relating to:        
Derivative instruments not designated as hedging instruments realized (loss) gain net 0 0 (610) (8,140)
Foreign currency forward contracts        
Realized (losses) gains relating to:        
Derivative instruments not designated as hedging instruments realized (loss) gain net 1,609 (2,583) 638 (9,915)
Unrealized gains (losses) relating to:        
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 735 6,006 4,383 21,070
Time-charter swap agreement        
Realized (losses) gains relating to:        
Derivative instruments not designated as hedging instruments realized (loss) gain net 0 1,096 1,106 1,222
Unrealized gains (losses) relating to:        
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 0 208 (875) 1,553
Forward freight agreements        
Realized (losses) gains relating to:        
Derivative instruments not designated as hedging instruments realized (loss) gain net 234 0 347 0
Unrealized gains (losses) relating to:        
Derivative instruments not designated as hedging instruments unrealized gain (loss) net (91) 0 (108) 0
Stock purchase warrants        
Unrealized gains (losses) relating to:        
Derivative instruments not designated as hedging instruments unrealized gain (loss) net $ (4,461) $ (398) $ (5,036) $ (8,894)