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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivatives, Fair Value [Line Items]          
Derivative liabilities (note 15) $ 31,717   $ 31,717   $ 48,388
Prepaid Expenses and Other 55,047   55,047   38,180
Current portion of derivative liabilities (note 15) 13,036   13,036   $ 80,423
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (16,504) $ (13,886) (25,362) $ (46,718)  
Unrealized gains relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 14,336 7,758 43,343 3,545  
Total realized and unrealized gains (losses) on derivative instruments (2,168) (6,128) 17,981 (43,173)  
Interest rate swap agreements          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (2,704) (15,729) (11,544) (48,199)  
Unrealized gains relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 19,718 11,575 44,169 5,181  
Interest rate swap agreement terminations          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (13,681) 0 (13,681) (610)  
Foreign currency forward contracts          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net 0 1,609 0 638  
Unrealized gains relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 0 735 0 4,383  
Time-charter swap agreement          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net 0 0 0 1,106  
Unrealized gains relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 0 0 0 (875)  
Forward freight agreements          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (119) 234 (137) 347  
Unrealized gains relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net (9) (91) 25 (108)  
Stock purchase warrants          
Unrealized gains relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net $ (5,373) $ (4,461) $ (851) $ (5,036)