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New Accounting Principles Not Yet in Effect - Summary of Accounting Standards (Detail)
 12 Months Ended
Dec. 31, 2017
IFRS 9 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Financial Instruments [1]
IFRS 15 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Revenue from Contracts with Customers (and the related Clarifications) [1]
IFRS 16 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Leases [2]
Amendments to IFRS 2 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Classification and measurement of share-based payments [1]
Amendments to IFRS 10 and IAS 28 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Sale or Contribution of Assets between an Investor and its Associate or Joint Venture [3]
Amendments to IAS 40 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Transfers of Investment Property [1]
Annual Improvements to IFRS Standards [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Annual Improvements to IFRS Standards 2014-2016 Cycle [1]
IFRIC 22 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Title of new IFRS Foreign Currency Transactions and Advance Consideration [1]
[1] Effective for annual periods beginning on or after 1 January 2018, with earlier application permitted.
[2] Effective for annual periods beginning on or after 1 January 2019, with earlier application permitted
[3] Effective for annual periods beginning on or after a date to be determined