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Long-term debt - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
vessel
semi-annual_payment
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]    
Repayments of borrowings $ 388,216,000 $ 213,622,000
Accretion of deferred financing costs 3,600,000 3,600,000
Debt instruments issued $ 29,849,000 30,242,000
Egypt limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Number of semi-annual principal payments | semi-annual_payment 24  
Egypt limited recourse debt facilities | Egypt entity    
Disclosure of detailed information about borrowings [line items]    
Percentage of gas requirements (greater than) 70.00%  
Egypt limited recourse debt facilities | Minimum | LIBOR    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 0.90%  
Egypt limited recourse debt facilities | Maximum | LIBOR    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 1.60%  
Other limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Repayments of borrowings $ 60,600,000  
Other limited recourse debt facilities | 50% owned subsidiary    
Disclosure of detailed information about borrowings [line items]    
Ownership rate 50.00%  
Other limited recourse debt facilities, 5.35% due September 30, 2033    
Disclosure of detailed information about borrowings [line items]    
Number of vessels to be acquired | vessel 2  
Other limited recourse debt facilities, 5.35% due September 30, 2033 | 50% owned subsidiary    
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 86,000,000  
Other limited recourse debt facilities, 5.35% due September 30, 2033 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.35%  
Other limited recourse debt facilities, 5.58% due June 30, 2031    
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 80,000,000  
Other limited recourse debt facilities, 5.58% due June 30, 2031 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.58%  
5.25% due December 15, 2029    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.25%  
Debt instruments issued $ 700,000,000  
5.25% due December 15, 2029 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.25%  
3.25% due December 15, 2019    
Disclosure of detailed information about borrowings [line items]    
Repayments of borrowings $ 350,000,000  
3.25% due December 15, 2019 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 3.25%  
Construction facilities    
Disclosure of detailed information about borrowings [line items]    
Undrawn borrowing facilities $ 800,000,000 0
Revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Debt covenant, debt to capitalization ratio (less than or equal) 57.50%  
Default payment accelerated by a creditor, amount of indebtedness (or more) $ 50,000,000  
Default that permits a creditor to demand repayment, amount of indebtedness (or more) 50,000,000  
Undrawn borrowing facilities $ 300,000,000 $ 300,000,000
Debt covenant, EBITDA to interest coverage ratio 2  
Revolving credit facility | Minimum    
Disclosure of detailed information about borrowings [line items]    
Debt covenant, EBITDA to interest coverage ratio 1.25