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Long-Term Debt - Additional Information - Term Loans (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) term_loan vessel | Dec. 31, 2020 USD ($) vessel | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |
Carrying amount of long-term debt | $ 680,085 | $ 605,147 |
Unrealized foreign exchange gain (loss) | (2,414) | (2,345) | $ (3,523)
Long-term Debt, Excluding Current Maturities | 416,174 | 572,036 |
Current portion of long-term debt (note 8) | $ 255,306 | 10,858 |
US Dollar Denominated Term Loans Due Through Two Thousand Twenty Three |  |  |
Debt Instrument [Line Items] |  |  |
Number of debt instruments | term_loan | 1 |  |
Carrying amount of long-term debt | $ 53,339 | $ 64,568 |
Number of vessels | vessel | 4 | 4 |
US Dollar Denominated Term Loans Due Through Two Thousand Twenty Three | United States of America, Dollars |  |  |
Debt Instrument [Line Items] |  |  |
Carrying amount of long-term debt | $ 53,300 | $ 64,600 |
US Dollar Denominated Term Loans Due Through Two Thousand Twenty Three | Remaining Term Loans | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument spread on variable rate | 2.25% | 2.25% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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