XML 167 R139.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Summary of Effective Income Tax From Statutory Canadian Tax Rates (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of average effective tax rate and applicable tax rate [abstract]    
Income tax expense at statutory Canadian rates 27.00% 27.00%
Increase (decrease) resulting from:    
Rate differential on foreign income 4.00% 5.20%
Unrecognized tax losses and temporary differences (0.50%) 1.10%
Non-deductible acquisition-related costs   1.20%
Non-deductible meals and entertainment 0.90% 1.00%
Income from associated companies (0.30%) 0.70%
Non-taxable foreign income (4.10%) (7.30%)
Research and development and other tax credits (2.70%) (1.30%)
Disposition of a subsidiary 30.30%  
Reorganization of corporate structure 1.20%  
Statutory rate change on deferred tax balances (4.80%)  
Transition tax related to US tax reform 11.80%  
Other 0.40% 0.20%
Average effective tax rate 63.20% 27.80%