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Property, plant and equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized interest   $ 36,750 $ 36,750
Impairment of property, plant, and equipment   447,808 $ 0
Greece [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment of property, plant, and equipment   330,238  
Impairment charges, net of deferred tax   $ 247,679  
Individual assets or cash-generating units [member] | Turkey [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment of property, plant, and equipment $ 117,570    
Impairment charges, net of deferred tax $ 94,056