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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, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | ---
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 14,612,382 | $ 2,258,028 | ¥ 14,303,746
Expected credit loss | ¥ 43,519 | $ 6,725 | ¥ 57,611
Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 13.10% | 13.10% | 7.20%
Expected credit loss | ¥ 43,519 |  | ¥ 57,611
Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | 332,567 |  | 794,678
Current [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 126,706 |  | ¥ 601,094
Days past due 0- 90 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 4.20% | 4.20% | 6.90%
Expected credit loss | ¥ 3,860 |  | ¥ 4,283
Days past due 0- 90 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 91,233 |  | ¥ 61,917
Days Past due 91-180 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 4.90% | 4.90% | 6.20%
Expected credit loss | ¥ 1,451 |  | ¥ 1,513
Days Past due 91-180 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 29,675 |  | ¥ 24,409
Days past due 181-365 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 7.80% | 7.80% | 10.90%
Expected credit loss | ¥ 2,852 |  | ¥ 4,386
Days past due 181-365 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 36,413 |  | ¥ 40,213
Days past due greater than 365 days [member] | Trade receivables [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Expected credit loss rate | 72.80% | 72.80% | 70.70%
Expected credit loss | ¥ 35,356 |  | ¥ 47,429
Days past due greater than 365 days [member] | Trade receivables [member] | Cost [member] |  |  |
Disclosure of provision matrix [line items] |  |  |
Financial assets | ¥ 48,540 |  | ¥ 67,045

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