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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Equity-Accounted Joint Ventures - Investments in and Advances to Equity Accounted Investees (Details) $ in Thousands	Dec. 31, 2019 USD ($) vessel terminal	Dec. 31, 2018 USD ($)	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	100.00%
Less current portion of advances to equity-accounted joint ventures	$ 0	$ (79,108)
Investment in and advances to equity-accounted joint ventures (note 7)	$ 1,155,316	1,037,025
Bahrain LNG Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	30.00%		30.00%
Less current portion of advances to equity-accounted joint ventures		(79,100)
Yamal LNG Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	50.00%
Exmar LPG Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	50.00%
MALT Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	52.00%
Excalibur Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	50.00%
Angola Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	33.00%
Number of vessels \| vessel	4
RasGas 3 Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	40.00%
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Number of vessels \| vessel	48
Equity method investments	$ 1,155,316	1,116,133
Less current portion of advances to equity-accounted joint ventures	0	(79,108)
Investment in and advances to equity-accounted joint ventures (note 7)	$ 1,155,316	1,037,025
Equity Method Investments \| Bahrain LNG Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	30.00%
Equity method investments	$ 60,462	81,353
Equity Method Investments \| Yamal LNG Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	50.00%
Number of vessels \| vessel	6
Equity method investments	$ 264,126	205,839
Equity Method Investments \| Pan Union Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of vessels \| vessel	4
Equity method investments	$ 79,568	73,545
Equity Method Investments \| Exmar LPG Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	50.00%
Number of vessels \| vessel	23
Equity method investments	$ 151,673	153,808
Equity Method Investments \| MALT Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	52.00%
Number of vessels \| vessel	6
Equity method investments	$ 357,411	351,529
Equity Method Investments \| Excalibur Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	50.00%
Number of vessels \| vessel	1
Equity method investments	$ 32,691	32,402
Equity Method Investments \| Angola Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	33.00%
Number of vessels \| vessel	4
Equity method investments	$ 88,465	85,469
Equity Method Investments \| RasGas 3 Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	40.00%
Number of vessels \| vessel	4
Equity method investments	$ 120,920	$ 132,188
Equity Method Investments \| LNG Receiving and Regasification Terminal \| Bahrain LNG Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of terminals \| terminal	1
Equity Method Investments \| LNG Terminal
Schedule of Equity Method Investments [Line Items]
Number of terminals \| terminal	1
Equity Method Investments \| Minimum \| Pan Union Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	20.00%
Equity Method Investments \| Maximum \| Pan Union Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percentage)	30.00%