Investment Properties - Additional Information (Detail) - PHP (₱)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Investment Property [Line Items]
Repairs and maintenance expenses related to investment properties that do not generate rental income	₱ 38,000,000	₱ 27,000,000	₱ 23,000,000
Rental income relating to investment properties	67,000,000	68,000,000	₱ 74,000,000
Transfers into of Level 3 of fair value hierarchy, investment properties	0	0
Transfers out of Level 3 of fair value hierarchy, investment properties	0	₱ 0
Investment property [member]
Disclosure Of Investment Property [Line Items]
Transfers into of Level 3 of fair value hierarchy, investment properties	0
Transfers out of Level 3 of fair value hierarchy, investment properties	0
Market Approach Using Price Per Square Meter [Member] \| Bottom Of Range [Member]
Disclosure Of Investment Property [Line Items]
Valuation for land, price per square meter	25,000
Market Approach Using Price Per Square Meter [Member] \| Top of range [member]
Disclosure Of Investment Property [Line Items]
Valuation for land, price per square meter	₱ 30,000

The amount of direct operating expenses (including repairs and maintenance) arising from investment property that did not generate rental income during the period recognised in profit or loss. [Refer: Investment property]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2018-01-01
-Paragraph 75
-Subparagraph f
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_75_f_iii&doctype=Standard
-URIDate 2018-03-16

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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.

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- Definition

The amount of property, plant and equipment representing land held by the entity for use in operations. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 16
-IssueDate 2018-01-01
-Paragraph 37
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_37_a&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of receivables arising from the rental of properties. Property is land or a building - or part of a building - or both.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2018-01-01
-Paragraph 93
-Subparagraph e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iv&doctype=Standard
-URIDate 2018-03-16

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- Definition

The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

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