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Financial Instruments - Summary of Partnership's Financing receivables and Direct financing leases (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Financing Receivable, Recorded Investment [Line Items] |  |
Total Lease and Financing Lease Receivable Originated three years prior to the latest fiscal year | $ 210,190 |
Total Lease and Financing Lease Receivable Originated one year prior to the latest fiscal year | 660 |
Total Lease and Financing Lease Receivable | 639,440 | $ 660,879
Total Lease and Financing Lease Receivable Originated five or more years prior to the latest fiscal year | 428,590 |
Total Lease and Financing Lease Receivable Originated four years prior to the latest fiscal year |  | 447,949
Total Lease and Financing Lease Receivable Originated two years prior to the latest fiscal year |  | 211,939
Total Lease and Financing Lease Receivable Current year |  | 991
Performing Financial Instruments [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net Investment in Lease, Originated Four Years before Latest Fiscal Year |  | 332,308
Net Investment in Lease, Originated Five or More Years before Latest Fiscal Year | 322,949 |
Net Investment in Lease | 533,139 | 544,247
Direct Financing Lease, Net Investment in Lease, Originated Two Years before Latest Fiscal Year |  | 211,939
Direct Financing Lease, Net Investment in Lease, Year One, Originated, Current Fiscal Year |  | 0
Direct Financing Lease, Net Investment in Lease, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Direct Financing Lease, Net Investment in Lease, Year Four, Originated, Three Years before Current Fiscal Year | 210,190 |
Performing Financial Instruments [Member] | Corporate Joint Venture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net Investment in Lease, Originated Four Years before Latest Fiscal Year |  | 332,308
Net Investment in Lease, Originated Five or More Years before Latest Fiscal Year | 322,949 |
Net Investment in Lease | 322,949 | 332,308
Direct Financing Lease, Net Investment in Lease, Originated Two Years before Latest Fiscal Year |  | 0
Direct Financing Lease, Net Investment in Lease, Year One, Originated, Current Fiscal Year |  | 0
Direct Financing Lease, Net Investment in Lease, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Direct Financing Lease, Net Investment in Lease, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Performing Financial Instruments [Member] | Subsidiaries |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net Investment in Lease, Originated Four Years before Latest Fiscal Year |  | 0
Net Investment in Lease, Originated Five or More Years before Latest Fiscal Year | 0 |
Net Investment in Lease | 210,190 | 211,939
Direct Financing Lease, Net Investment in Lease, Originated Two Years before Latest Fiscal Year |  | 211,939
Direct Financing Lease, Net Investment in Lease, Year One, Originated, Current Fiscal Year |  | 0
Direct Financing Lease, Net Investment in Lease, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Direct Financing Lease, Net Investment in Lease, Year Four, Originated, Three Years before Current Fiscal Year | 210,190 |
Loans Receivable [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year |  | 0
Financing Receivable, Originated Four Years before Latest Fiscal Year |  | 115,641
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 105,641 |
Financing Receivable, before Allowance for Credit Loss | 106,301 | 116,632
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 660 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 991
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Loans Receivable [Member] | Exmar Lpg Bvba [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year |  | 0
Financing Receivable, Originated Four Years before Latest Fiscal Year |  | 42,266
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 32,266 |
Financing Receivable, before Allowance for Credit Loss | 32,266 | 42,266
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Loans Receivable [Member] | Bahrain LNG Joint Venture [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year |  | 0
Financing Receivable, Originated Four Years before Latest Fiscal Year |  | 73,375
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 73,375 |
Financing Receivable, before Allowance for Credit Loss | 73,375 | 73,375
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | 0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |
Loans Receivable [Member] | Angola LNG Joint Venture | Performing Financial Instruments [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year |  | 0
Financing Receivable, Originated Four Years before Latest Fiscal Year |  | 0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |
Financing Receivable, before Allowance for Credit Loss | 660 | 991
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 660 |
Financing Receivable, Year One, Originated, Current Fiscal Year |  | $ 991
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | $ 0 |

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