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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
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Realized (losses) gains relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | $ (27,442) | $ (52,488) | $ (104,492)
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 12,590 | 13,634 | 69,401
Total realized and unrealized losses on derivative instruments | (14,852) | (38,854) | (35,091)
Interest Rate Swap Agreements |  |  |
Realized (losses) gains relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (13,898) | (53,921) | (87,320)
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 33,700 | 17,005 | 62,446
Interest rate swap agreement terminations |  |  |
Realized (losses) gains relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (13,681) | (610) | (8,140)
Foreign currency forward contracts |  |  |
Realized (losses) gains relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | 667 | (11,186)
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | 3,925 | 15,833
Stock Purchase Warrants |  |  |
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | (21,053) | (6,421) | (9,753)
Time-charter Swap Agreement |  |  |
Realized (losses) gains relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | 1,106 | 2,154
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | (875) | 875
Forward freight agreements |  |  |
Realized (losses) gains relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 137 | 270 | 0
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | $ (57) | $ 0 | $ 0

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- Definition Derivative instruments not designated as hedging instruments realized gain (loss) net. + References No definition available. + Details
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- Definition Derivative instruments not designated as hedging instruments unrealized gain loss net. + References No definition available. + Details
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- Definition Realized losses gains. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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