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Significant Accounting Policies - Disclosure of Estimated Useful Lives for Investment Properties (Detail) | 12 Months Ended
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Dec. 31, 2017
Bottom of range [member] |
Disclosure of detailed information about investment property [line items] |
Estimated useful lives, Investment Property | 25 years
Top of range [member] |
Disclosure of detailed information about investment property [line items] |
Estimated useful lives, Investment Property | 45 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The useful lives or depreciation rates used for investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2017-03-01&anchor=para_79_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_UsefulLivesOrDepreciationRatesInvestmentPropertyCostModel
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
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Data Type: | na
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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
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Data Type: | na
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