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Disclosure of information on segments - Reconciliation of segment assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information on segments [Line Items]      
Assets $ 4,107,274 $ 4,217,221 $ 4,332,813
Operating Segments [Member]      
Disclosure of information on segments [Line Items]      
Assets 15,777,279 15,369,524 15,614,979
Elimination of assets of equity accounted investees [Member]      
Disclosure of information on segments [Line Items]      
Assets (10,517,053) (9,963,853) (10,090,873)
Elimination of equity pick up investments of the subsidiaries and associates of the Parent company [Member]      
Disclosure of information on segments [Line Items]      
Assets (1,111,454) (1,184,240) (1,186,783)
Elimination of intercompany receivables [Member]      
Disclosure of information on segments [Line Items]      
Assets (64,708) (32,444) (32,769)
Elimination of intersegment other assets amount [Member]      
Disclosure of information on segments [Line Items]      
Assets $ 23,210 $ 28,234 $ 28,259