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Financial Instruments - Schedule of Estimated Fair Value and Carrying Value of Partnership's Financial Instruments on Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents and restricted cash (note 15) | $ 155,627 | $ 257,943 | $ 254,837 | $ 253,291
Long-term debt | (1,385,692) | (1,472,213) |  |
Obligations related to finance leases (note 5a) | 1,287,044 | 1,340,922 |  |
Property, Plant and Equipment, Net, Excluding Capital Leased Assets | 1,194,238 | 1,220,355 |  |
Carrying Amount Asset (Liability) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans to equity-accounted joint ventures (note 7) | 106,301 | 116,632 |  |
Carrying Amount Asset (Liability) | Level 1 | Public |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | (346,246) | (352,260) |  |
Carrying Amount Asset (Liability) | Level 1 | Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents and restricted cash (note 15) | 155,627 | 257,943 |  |
Carrying Amount Asset (Liability) | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Obligations related to finance leases (note 5a) | 1,287,044 | 1,340,922 |  |
Carrying Amount Asset (Liability) | Level 2 | Non-public |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | (1,039,446) | (1,119,953) |  |
Carrying Amount Asset (Liability) | Level 2 | Recurring | LPG Carriers [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Property, Plant and Equipment, Net, Excluding Capital Leased Assets | 0 | 40,717 |  |
Carrying Amount Asset (Liability) | Level 2 | Recurring | Interest rate swap agreements |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swap agreements – assets | 1,823 | 0 |  |
Interest rate swap agreements – liabilities | (35,401) | (75,468) |  |
Carrying Amount Asset (Liability) | Level 2 | Recurring | Cross-currency swap agreements |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 3,895 | 4,505 |  |
Cross currency swap agreements – liabilities | (20,537) | (20,022) |  |
Fair Value Asset (Liability) | Level 1 | Public |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | (354,519) | (359,581) |  |
Fair Value Asset (Liability) | Level 1 | Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents and restricted cash (note 15) | 155,627 | 257,943 |  |
Fair Value Asset (Liability) | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Obligations related to finance leases (note 5a) | 1,363,615 | 1,456,927 |  |
Fair Value Asset (Liability) | Level 2 | Non-public |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | (1,061,418) | (1,137,050) |  |
Fair Value Asset (Liability) | Level 2 | Recurring | LPG Carriers [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Property, Plant and Equipment, Net, Excluding Capital Leased Assets | 0 | 40,717 |  |
Fair Value Asset (Liability) | Level 2 | Recurring | Interest rate swap agreements |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swap agreements – assets | 1,823 | 0 |  |
Interest rate swap agreements – liabilities | (35,401) | (75,468) |  |
Fair Value Asset (Liability) | Level 2 | Recurring | Cross-currency swap agreements |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value | 3,895 | 4,505 |  |
Cross currency swap agreements – liabilities | $ (20,537) | $ (20,022) |  |

X
- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other 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. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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