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Long-Term Debt - Euro-denominated Term Loans- Additional Information (Details) $ in Thousands, € in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) subsidiary term_loan vessel | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) subsidiary term_loan vessel | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) subsidiary term_loan vessel | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of Term Loans | 6 |  | 6 |  | 6 |  |
Carrying amount of debt | $ | $ 1,427,228 |  | $ 1,427,228 |  |  | $ 1,481,936 |
Foreign currency exchange (loss) gain (notes 8 and 11) | $ | $ (2,843) | $ (11,624) | $ 4,117 | $ (6,885) |  |  |
Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate on debt |  |  | 0.60% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate on debt |  |  | 3.25% |  |  |  |
Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number Of Vessels | vessel | 2 |  | 2 |  | 2 |  |
Line of Credit | Financial Guarantee [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of subsidiaries that guaranteed the term loans | subsidiary | 2 |  | 2 |  | 2 |  |
Euro-denominated Term Loans due in 2023 and 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of Term Loans | 2 |  | 2 |  | 2 |  |
Carrying amount of debt | $ 134,400 |  | $ 134,400 |  | € 113.4 | $ 152,710 | € 125.0
Euro-denominated Term Loans due in 2023 and 2024 | Asset Pledged as Collateral [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number Of Vessels | vessel | 2 |  | 2 |  | 2 |  |
Euro-denominated Term Loans due in 2023 and 2024 | Financial Guarantee [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of subsidiaries that guaranteed the term loans | subsidiary | 1 |  | 1 |  | 1 |  |
Euro-denominated Term Loans due in 2023 and 2024 | EURIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of Term Loans | 1 |  | 1 |  | 1 |  |
Euro-denominated Term Loans due in 2023 and 2024 | EURIBOR | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate on debt |  |  | 0.60% |  |  |  |
Euro-denominated Term Loans due in 2023 and 2024 | EURIBOR | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable interest rate on debt |  |  | 1.95% |  |  |  |

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