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New Accounting Principles Not Yet in Effect - Summary of Accounting Standards (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2017
IFRS 9 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2018
IFRS 15 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2018
Amendments to IFRS 2 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2018
Amendments to IAS 40 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2018
Annual Improvements to IFRS Standards [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2018
IFRIC 22 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2018
IFRS 16 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective date of new and revised IFRS Jan. 01, 2019