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Leases - Additional Information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)
Statement [line items]
Cash outflows for leases	¥ 65.6	$ 9.3
Non-cash additions to right-of-use assets and lease liabilities	11.5	1.6
Operating lease rental income	¥ 11.9	$ 1.7	¥ 11.0
Bottom of range [member]
Statement [line items]
Land use rights, term	1 year	1 year
Operating lease term of contract	1 year	1 year
Top of range [member]
Statement [line items]
Land use rights, term	12 years	12 years
Operating lease term of contract	6 years	6 years

X

- Definition

Land use rights, term of contract.

+ References

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X

- Definition

Non cash additions to right of use assets and lease liabilities.

+ References

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- Definition

Operating lease, term of contract.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2019-03-27

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X

- Definition

The amount of operating lease income. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 90
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_90_b&doctype=Standard
-URIDate 2019-03-27

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