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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 |

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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=109980867&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=109980867&loc=SL5624171-113959 + Details
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