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New Accounting Principles Not Yet in Effect - Summary of Accounting Standards (Detail) | 12 Months Ended
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Dec. 31, 2018
IFRS 17 [Member] |
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items] |
Title of new IFRS | Insurance Contracts
Amendments to IFRS 9 [Member] |
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items] |
Title of new IFRS | Prepayment Features with Negative Compensation
Amendments to IAS 28 [Member] |
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items] |
Title of new IFRS | Long-term Interests in Associates and Joint Ventures
Annual Improvements to IFRS Standards [Member] |
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items] |
Title of new IFRS | Amendments to IFRS 3 Business Combinations, IFRS 11 Joint Arrangements, IAS 12 Income Taxes and IAS 23 Borrowing Costs
Amendments to IAS 19 [Member] |
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items] |
Title of new IFRS | Plan Amendment, Curtailment or Settlement
IFRS 10 [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
IFRIC 23 [Member] |
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items] |
Title of new IFRS | Uncertainty over Income Tax Treatments

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