XML 116 R88.htm IDEA: XBRL DOCUMENT v3.20.4
Shareholders' equity - Outstanding (Detail)
Dec. 31, 2020
EquityInstruments
Dec. 31, 2020
shares
Dec. 31, 2020
USD ($)
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