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Provision for Product Warranty - Summary of Provision for Product Warranty (Detail) - Product warranty provision [member] ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Disclosure of other provisions [line items]
Beginning balance	$ 28,671	¥ 191,814	¥ 169,006
Provision made	33,569	224,582	249,517
Provision utilized	(37,291)	(249,483)	(226,709)
Ending balance	$ 24,949	¥ 166,913	¥ 191,814

X

- Definition

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 amount recognised for new other provisions. [Refer: Other provisions]

+ References

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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

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- Definition

The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions]

+ References

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