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Basis of Preparation - Additional Information (Detail) - $ / $ | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Apr. 20, 2018
Disclosure of detailed information about investment property [line items] |  |
Conversion rate of Mexican pesos to U.S. dollars | 19.6395 |
Description of significant influence | If the Company holds, directly or indirectly, 20 per cent or more of the voting power of the investee, it is presumed that it has significant influence, unless it can be clearly demonstrated that this is not the case. If the Company holds, directly or indirectly, less than 20 per cent of the voting power of the investee, it is presumed that the Company does not have significant influence, unless such influence can be clearly demonstrated. |
CCFPI [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Percentage of ownership interest in joint venture | 51.00% |
Percentage of ownership interest in joint venture to be acquired | 49.00% |
Changes in foreign exchange rates [member] |  |
Disclosure of detailed information about investment property [line items] |  |
Conversion rate of Mexican pesos to U.S. dollars |  | 18.6145
Increase decrease in foreign currency exchange rate |  | 6.00%

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