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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Expenses (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)		Dec. 31, 2016 CNY (¥)
Profit or loss [abstract]
Loss on disposal of property, plant and equipment					¥ 14,020
Foreign exchange loss, net					4,006
Fair value loss on quoted equity securities	$ 513	¥ 3,433			243
Fair value loss on foreign exchange forward contract					140
Goodwill written off					1,131
Others	1,350	9,030	¥ 22,719		3,059
Other operating expenses	$ 1,863	¥ 12,463	¥ 22,719	[1]	¥ 22,599	[1]
[1] Restated

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Loss on change in fair value of foreign exchange forward contract.

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Losses on financial assets at fair value through profit or loss classified as quoted equity securities

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Others Operating Expense

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- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The losses on the disposal of property, plant and equipment. [Refer: Property, plant and equipment]

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The net loss arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)]

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The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'function of expense' form for its analysis of expenses.

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