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Financial Risk Management Objectives and Policies - Summary of Information about Credit Risk on Trade Receivables using Provision Matrix (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | ---
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 12,434,653 | $ 1,966,825 | ¥ 14,612,382
Expected credit loss | ¥ 33,210 | $ 5,253 | ¥ 43,519
Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 6.00% | 6.00% | 13.10%
Expected credit loss | ¥ 33,210 |  | ¥ 43,519
Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | 557,767 |  | 332,567
Current [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 279,402 |  | ¥ 126,706
Days past due 0- 90 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 0.60% | 0.60% | 4.20%
Expected credit loss | ¥ 916 |  | ¥ 3,860
Days past due 0- 90 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 154,494 |  | ¥ 91,233
Days Past due 91-180 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 5.90% | 5.90% | 4.90%
Expected credit loss | ¥ 2,234 |  | ¥ 1,451
Days Past due 91-180 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 37,756 |  | ¥ 29,675
Days past due 181-365 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 13.20% | 13.20% | 7.80%
Expected credit loss | ¥ 5,707 |  | ¥ 2,852
Days past due 181-365 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 43,084 |  | ¥ 36,413
Days past due greater than 365 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 56.60% | 56.60% | 72.80%
Expected credit loss | ¥ 24,355 |  | ¥ 35,356
Days past due greater than 365 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 43,031 |  | ¥ 48,540

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