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Investment Properties - Additional Information (Detail) $ in Thousands, ฿ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016 USD ($)	Dec. 31, 2016 THB (฿)	Dec. 31, 2015 USD ($)
Disclosure Of Investment Property [Abstract]
Investment property estimated useful lives	20 years
Consideration from sale of land		$ 4,695	฿ 165	$ 53
Gain from sale of land		$ 4,466	฿ 157	$ 32

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- References

No definition available.

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- Definition

The gain on disposals of investment properties. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
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- Definition

The cash inflow from sales of investment property. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
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The useful lives or depreciation rates used for investment property. [Refer: Investment property]

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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
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