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Income taxes - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Line Items]      
Internal restructuring, consideration transferred for marketing intangibles   $ 650,000  
Net excess tax benefits on share-based compensation $ 7,773 7,310 $ 2,743
Net operating loss carryforwards 145,525    
Deferred tax assets related to net operating loss carryforwards, excluding state 34,459    
Net operating loss of subsidiary, carried forward 47,025    
Additional deferred tax assets for U.S. state and local tax loss carry-forwards 3,134    
Undistributed earnings held by foreign subsidiaries for which no deferred tax liability would accrue on repatriation of retained earnings indefinitely reinvested 622,521    
Cash and cash equivalents held by foreign (non-Bermuda) subsidiaries 875,924    
Cash and cash equivalents 899,458 680,440  
Cash held by foreign subsidiary 3,481    
Cash and cash equivalents held by foreign (non-Bermuda) subsidiaries for which no tax will accrue on repatriation of retained earnings indefinitely reinvested 872,443    
Deferred tax assets 102,380 105,158  
Unrecognized tax benefits that would impact effective tax rate 25,651 34,300  
Unrecognized tax benefits, interest on income taxes accrued 2,842 6,369  
Unrecognized tax benefits, including exchange rate differences for interest recognized 628 900  
Accrued penalties $ (13,851) $ 662 826
ASC 326      
Income Tax Disclosure [Line Items]      
Deferred tax assets     $ 935
Tax Holiday For First 5 Years      
Income Tax Disclosure [Line Items]      
Tax holiday in respect to export profits (in percentage) 100.00%    
Tax holiday, period, in years 5 years    
Tax Holiday from year 6 to year 10      
Income Tax Disclosure [Line Items]      
Tax holiday in respect to export profits (in percentage) 50.00%    
Tax holiday, period, in years 5 years    
Tax Holiday from year 11 to year 15      
Income Tax Disclosure [Line Items]      
Tax holiday in respect to export profits (in percentage) 50.00%    
Tax holiday, period, in years 5 years    
Basic and diluted earnings per share      
Income Tax Disclosure [Line Items]      
Earnings per share effect of tax holiday (in usd per share) $ 0.02 $ 0.08 $ 0.11
Retained Earnings      
Income Tax Disclosure [Line Items]      
Repatriation of retained earnings $ 9,628