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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, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)
Disclosure of other provisions [Line Items]
Beginning balance	¥ 238,850	$ 37,737	¥ 233,577
Provision made	412,514	65,174	350,803
Provision utilized	(361,058)	(57,045)	(345,530)
Ending balance	¥ 290,306	$ 45,866	¥ 238,850

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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

+ References

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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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