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Income Tax Expense - Deferred Tax Assets That Have Not Been Recognized (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Unutilized tax losses	¥ 414,212	$ 65,517	¥ 404,215
Unutilized capital allowances and investment allowances	103,810	16,420	105,622
Other unrecognized temporary differences relating to asset impairment and deferred grants	199,203	31,508	204,423
Deferred tax assets have not been recognised	¥ 717,225	$ 113,445	¥ 714,260

X

- Definition

Unrecognized deferred tax assets.

+ References

No definition available.

+ Details

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X

- Definition

The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2021-03-24

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- References

No definition available.

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- Definition

The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2021-03-24

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