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Income Taxes - Summary of Income Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Canadian statutory income tax rate 26.50% 26.50%
Manufacturing and processing profits deduction (0.30%) (0.40%)
Foreign rate differentials (0.20%) 0.80%
Losses not benefited 0.80% 1.10%
Utilization of losses previously not benefited (0.20%) (0.10%)
Earnings of equity accounted investees (1.20%) (0.80%)
Tax on repatriation of foreign earnings 0.70% 2.10%
Valuation allowance on deferred tax assets (0.40%)  
Write off of investment   (1.40%)
Research and development tax credits (1.50%) (1.30%)
Reserve for uncertain tax positions 0.20% (0.30%)
Non-deductible foreign exchange losses 1.30% 1.00%
Others (0.30%) (0.40%)
Effective income tax rate 25.40% 26.80%