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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Realized (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | $ (4,442) | $ (4,080) | $ (27,344) | $ (7,047)
Unrealized gains (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 1,053 | (5,190) | 31,276 | (23,886)
Realized and unrealized gains (losses) on derivative instruments | (3,389) | (9,270) | 3,932 | (30,933)
Interest rate swap agreements |  |  |  |
Realized (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (4,353) | (3,879) | (9,271) | (6,556)
Unrealized gains (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 1,323 | (5,251) | 31,579 | (24,063)
Foreign currency forward contracts |  |  |  |
Realized (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | 0 | 0 | (241)
Unrealized gains (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | 53 | 0 | 255
Forward freight agreements |  |  |  |
Realized (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (89) | (201) | (61) | (250)
Unrealized gains (losses) relating to |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | $ (270) | $ 8 | $ (303) | $ (78)

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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