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Investment Properties - Summary of Investment Properties (Detail) - 12 months ended Dec. 31, 2017 $ in Thousands, $ in Thousands	TWD ($)	USD ($)
Disclosure of detailed information about investment property [line items]
Depreciation expenses	$ 122,231	$ 4,124
Balance at December 31, 2017	8,119,436	273,935
Cost [member]
Disclosure of detailed information about investment property [line items]
Additions	186,535	6,293
Disposals	(342)	(11)
Transfers from inventories related to real estate business and property, plant and equipment	8,150,075	274,968
Effects of foreign currency exchange differences	106,482	3,593
Balance at December 31, 2017	8,442,750	284,843
Cost [member] | Land [member]
Disclosure of detailed information about investment property [line items]
Transfers from inventories related to real estate business and property, plant and equipment	35,965	1,213
Balance at December 31, 2017	35,965	1,213
Cost [member] | Buildings and improvements [member]
Disclosure of detailed information about investment property [line items]
Additions	186,535	6,293
Disposals	(342)	(11)
Transfers from inventories related to real estate business and property, plant and equipment	8,114,110	273,755
Effects of foreign currency exchange differences	106,482	3,593
Balance at December 31, 2017	8,406,785	283,630
Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about investment property [line items]
Depreciation expenses	122,231	4,124
Disposals	(161)	(5)
Transfers from inventories related to real estate business and property, plant and equipment	199,745	6,739
Effects of foreign currency exchange differences	1,499	50
Balance at December 31, 2017	323,314	10,908
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member]
Disclosure of detailed information about investment property [line items]
Depreciation expenses	122,231	4,124
Disposals	(161)	(5)
Transfers from inventories related to real estate business and property, plant and equipment	199,745	6,739
Effects of foreign currency exchange differences	1,499	50
Balance at December 31, 2017	$ 323,314	$ 10,908

X

- Definition

The increase in investment property resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Investment property]

+ References

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- Definition

The amount of depreciation recognised on investment property. [Refer: Depreciation and amortisation expense; Investment property]

+ References

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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 decrease in investment property resulting from disposals. [Refer: Investment property]

+ References

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The increase (decrease) in investment property resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Investment property]

+ References

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- Definition

Expiry date 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee under a finance lease) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. Effective 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

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- Definition

The amount transferred from (to) inventories and owner-occupied property to (from) investment property. [Refer: Inventories; Investment property]

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