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Long-Term Debt - Additional Information - USD Term Loans (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) term_loan vessel | Dec. 31, 2017 USD ($) vessel
Debt Instrument [Line Items] |  |
Carrying amount of long-term debt | $ | $ 3,363,127 | $ 3,449,611
Interest at a weighted-average fixed rate | 5.10% | 4.30%
Secured debt |  |
Debt Instrument [Line Items] |  |
Number of debt instruments | 11 |
Carrying amount of long-term debt | $ | $ 1,500,000 | $ 1,400,000
Number of term loans which have balloon or bullet repayments | 9 |
Number of vessels | vessel | 24 | 22
Secured debt | Remaining Term Loans | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Number of debt instruments | 2 |
Secured debt | Remaining Term Loans | Three-month LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument spread on variable rate | 0.30% |
Debt term (in years) | 3 months |
Secured debt | Remaining Term Loans | Three-month LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument spread on variable rate | 3.50% |
Debt term (in years) | 6 months |
Secured debt | Term Loan One |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 4.41% |
Secured debt | Term Loan One | Fixed Rate |  |
Debt Instrument [Line Items] |  |
Number of debt instruments | 1 |
Secured debt | Term Loan Two |  |
Debt Instrument [Line Items] |  |
Debt interest rate | 5.37% |

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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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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