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v3.20.1

Long-Term Debt - Additional Information - USD Term Loans (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) vessel term_loan | Dec. 31, 2018 USD ($) vessel
Debt Instrument [Line Items] |  |
Carrying amount of long-term debt | $ | $ 2,867,120 | $ 3,363,127
Secured debt |  |
Debt Instrument [Line Items] |  |
Number of debt instruments | 10 |
Number of term loans which have balloon or bullet repayments | 8 |
Number of vessels | vessel | 24 | 24
Secured debt | Remaining Term Loans | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Number of debt instruments | 2 |
Secured debt | Remaining Term Loans | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument spread on variable rate | 0.30% | 0.30%
Secured debt | Remaining Term Loans | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument spread on variable rate | 3.25% | 3.50%
Secured debt | Remaining Term Loans | Three-month LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Term | 3 months |
Secured debt | Remaining Term Loans | Three-month LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Term | 6 months |
Secured debt | Term Loan One |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 4.48% |

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- Definition Number of debt instruments with balloon or bullet payments. + References No definition available. + Details
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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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