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Commitments and contingencies - Summary of assessments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses $ 252,412
Tax Assessments Penalties And Interest Expense 468,400
Total 720,812
Year 2003 - 2005 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 8,684
Tax Assessments Penalties And Interest Expense 39,402
Total 48,086
Year 2006 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 10,998
Tax Assessments Penalties And Interest Expense 51,565
Total 62,563
Year 2007 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 11,579
Tax Assessments Penalties And Interest Expense 22,102
Total 33,681
Year 2008 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 16,907
Tax Assessments Penalties And Interest Expense 16,923
Total 33,830
Year 2009 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 56,000
Tax Assessments Penalties And Interest Expense 51,604
Total 107,604
Year 2010 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 53,573
Tax Assessments Penalties And Interest Expense 121,952
Total 175,525
Year 2011 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 40,593
Tax Assessments Penalties And Interest Expense 65,366
Total 105,959
Year 2012 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 869
Tax Assessments Penalties And Interest Expense 6,718
Total 7,587
Year 2013 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 48,063
Tax Assessments Penalties And Interest Expense 65,014
Total 113,077
Year 2014 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 181
Tax Assessments Penalties And Interest Expense 3,208
Total 3,389
Year 2015 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 763
Tax Assessments Penalties And Interest Expense 21,894
Total 22,657
Year 2016 [Member]  
Disclosure of Commitments and contingencies [Line Items]  
Tax assessments, Estimated possible losses 4,202
Tax Assessments Penalties And Interest Expense 2,652
Total $ 6,854