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Business Combinations - Summary of Net Cash Outflow on Acquisition of Subsidiaries (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)
Disclosure of detailed information about business combination [Line Items]
Less: Cash acquired	$ (29,133)	$ (983)
Net cash outflow on acquisition of subsidiaries	(7,046,464)	$ (237,735)
TLJ Intertech Inc. [member]
Disclosure of detailed information about business combination [Line Items]
Consideration paid in cash	$ 89,998		$ 89,998
Less: Cash acquired			(16,561)
Net cash outflow on acquisition of subsidiaries			$ 73,437

X

- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of cash and cash equivalents in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]; Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]]

+ References

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- Definition

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