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Shareholders' equity - Outstanding (Detail)
Dec. 31, 2020
EquityInstruments
Dec. 31, 2020
USD ($)
Dec. 31, 2020
shares
Dec. 31, 2019
EquityInstruments
shares
Dec. 31, 2018
EquityInstruments
Shareholders' equity          
Common share outstanding     190,956,476 189,381,388  
Stock options 745,962 745,962   836,427 1,015,409
Restricted Share Units | EquityInstruments 102,708     108,978  
Total     191,805,146 190,326,793