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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
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | $ (4,049) | $ (17,097) | $ (8,858) | $ (32,832)
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 14,772 | (13,473) | 29,007 | (4,213)
Total realized and unrealized gains (losses) on derivative instruments | 10,723 | (30,570) | 20,149 | (37,045)
Interest rate swap agreements |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (4,031) | (15,914) | (8,840) | (32,470)
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 8,532 | (15,517) | 24,451 | (6,394)
Interest rate swap agreement terminations |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | (1,005) | 0 | (610)
Foreign currency forward contracts |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | (618) | 0 | (971)
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | 2,808 | 0 | 3,648
Time-charter swap agreement |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | 360 | 0 | 1,106
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | (402) | 0 | (875)
Forward freight agreements |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (18) | 80 | (18) | 113
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 34 | (30) | 34 | (17)
Stock purchase warrants |  |  |  |
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | $ 6,206 | $ (332) | $ 4,522 | $ (575)

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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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