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Financial Risk Management Objectives and Policies - Additional Information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2018 CNY (¥) Customer	Dec. 31, 2017 CNY (¥) Customer	Dec. 31, 2018 CNY (¥)
Disclosure of detailed information about financial instruments [line items]
Basis points	0.50%		0.50%	0.50%
Increase decrease in profit before tax on basis of higher lower basis points	$ 3.3	¥ 20.6	¥ 22.0
People's Republic of China [member]
Disclosure of detailed information about financial instruments [line items]
Number of top customers	20	20	20
People's Republic of China [member] | Top 20 Customers [member]
Disclosure of detailed information about financial instruments [line items]
Amount owed	$ 17.1		¥ 57.2	¥ 114.2
Percentage of trade receivables excluding bills receivables	26.00%	26.00%	22.40%

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The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

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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.

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The amount due from customers for goods and services sold.

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