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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liabilities (note 15) | $ 31,717 |  | $ 31,717 |  | $ 48,388
Prepaid Expenses and Other | 55,047 |  | 55,047 |  | 38,180
Current portion of derivative liabilities (note 15) | 13,036 |  | 13,036 |  | $ 80,423
Realized losses relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (16,504) | $ (13,886) | (25,362) | $ (46,718) |
Unrealized gains relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 14,336 | 7,758 | 43,343 | 3,545 |
Total realized and unrealized gains (losses) on derivative instruments | (2,168) | (6,128) | 17,981 | (43,173) |
Interest rate swap agreements |  |  |  |  |
Realized losses relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (2,704) | (15,729) | (11,544) | (48,199) |
Unrealized gains relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 19,718 | 11,575 | 44,169 | 5,181 |
Interest rate swap agreement terminations |  |  |  |  |
Realized losses relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (13,681) | 0 | (13,681) | (610) |
Foreign currency forward contracts |  |  |  |  |
Realized losses relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | 1,609 | 0 | 638 |
Unrealized gains relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | 735 | 0 | 4,383 |
Time-charter swap agreement |  |  |  |  |
Realized losses relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | 0 | 0 | 0 | 1,106 |
Unrealized gains relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 0 | 0 | 0 | (875) |
Forward freight agreements |  |  |  |  |
Realized losses relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (119) | 234 | (137) | 347 |
Unrealized gains relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | (9) | (91) | 25 | (108) |
Stock purchase warrants |  |  |  |  |
Unrealized gains relating to |  |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | $ (5,373) | $ (4,461) | $ (851) | $ (5,036) |

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- Definition Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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