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Commitments and contingencies - Summary of assessments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses $ 312,000
Tax Assesment, Penalties Expense 356,941
Tax Assesments, penalties and interest expenses 668,941
Year 2003 - 2005 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 8,857
Tax Assesment, Penalties Expense 39,196
Tax Assesments, penalties and interest expenses 48,053
Year 2006 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 10,990
Tax Assesment, Penalties Expense 51,943
Tax Assesments, penalties and interest expenses 62,933
Year 2007 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 12,376
Tax Assesment, Penalties Expense 17,845
Tax Assesments, penalties and interest expenses 30,221
Year 2008 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 20,797
Tax Assesment, Penalties Expense 12,968
Tax Assesments, penalties and interest expenses 33,765
Year 2009 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 56,388
Tax Assesment, Penalties Expense 51,219
Tax Assesments, penalties and interest expenses 107,607
Year 2010 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 62,581
Tax Assesment, Penalties Expense 107,324
Tax Assesments, penalties and interest expenses 169,905
Year 2011 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 49,055
Tax Assesment, Penalties Expense 65,189
Tax Assesments, penalties and interest expenses 114,244
Year 2012 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 51,981
Tax Assesment, Penalties Expense 11,257
Tax Assesments, penalties and interest expenses 63,238
Year 2014 - 2017 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assesments, Estimated possible losses 38,975
Tax Assesment, Penalties Expense 0
Tax Assesments, penalties and interest expenses $ 38,975