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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]          
Prepaid Expenses and Other $ 108,274   $ 108,274   $ 69,882
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (27,373) $ (4,049) (29,074) $ (8,858)  
Unrealized gains (losses) relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 16,409 14,772 12,687 29,007  
Total realized and unrealized gains (losses) on derivative instruments (10,964) 10,723 (16,387) 20,149  
Interest rate swap agreements          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (1,785) (4,031) (3,473) (8,840)  
Unrealized gains (losses) relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net (8,195) 8,532 (14,216) 24,451  
Foreign currency forward contracts          
Unrealized gains (losses) relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net (101) 0 (101) 0  
Stock purchase warrants          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (25,559) 0 (25,559) 0  
Unrealized gains (losses) relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net 24,584 6,206 26,900 4,522  
Forward freight agreements          
Realized losses relating to          
Derivative instruments not designated as hedging instruments realized (loss) gain net (29) (18) (42) (18)  
Unrealized gains (losses) relating to          
Derivative instruments not designated as hedging instruments unrealized gain (loss) net $ 121 $ 34 $ 104 $ 34