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Provision - Summary of Provision (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($)
Disclosure of other provisions [line items] |  |  |  |
Beginning balance | ¥ 218,031 | $ 33,692 | ¥ 166,913 | $ 25,793
Provision made | 349,303 | 53,977 | 424,221 | 65,554
Provision utilized | (295,940) | (45,731) | (373,103) | (57,655)
Provision reversed | (2,316) | (358) |  |
Ending balance | 269,078 | $ 41,580 | 218,031 | $ 33,692
Product warranty provision [member] |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Beginning balance | 215,715 |  | 166,913 |
Provision made | 335,664 |  | 421,905 |
Provision utilized | (295,940) |  | (373,103) |
Ending balance | 255,439 |  | 215,715 |
Provision for onerous contract [member[ |  |  |  |
Disclosure of other provisions [line items] |  |  |  |
Beginning balance | 2,316 |  |  |
Provision made | 13,639 |  | 2,316 |
Provision reversed | (2,316) |  |  |
Ending balance | ¥ 13,639 |  | ¥ 2,316 |

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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_d&doctype=Standard -URIDate 2020-01-01 + Details
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