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Segmented information - Property, plant and equipment, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]    
Property, plant and equipment $ 2,998,326 $ 3,117,469
United States    
Disclosure of geographical areas [line items]    
Property, plant and equipment 1,412,394 1,468,283
Egypt    
Disclosure of geographical areas [line items]    
Property, plant and equipment 720,397 742,446
New Zealand    
Disclosure of geographical areas [line items]    
Property, plant and equipment 265,153 261,482
Trinidad    
Disclosure of geographical areas [line items]    
Property, plant and equipment 155,525 176,256
Canada    
Disclosure of geographical areas [line items]    
Property, plant and equipment 148,420 154,982
Chile    
Disclosure of geographical areas [line items]    
Property, plant and equipment 107,495 108,065
Other    
Disclosure of geographical areas [line items]    
Property, plant and equipment $ 188,942 $ 205,955