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Capital Management - Summary of Capital Structure (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
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Disclosure of objectives, policies and processes for managing capital [abstract] |  |  |
Loans and borrowings (current and non-current) (Note 26(b)) | ¥ 2,230,000 | $ 344,598 | ¥ 2,055,046
Lease liabilities (current and non-current) (Note 25) | 39,778 | 6,147 | 60,007
Trade and other payables (current and non-current) (Note 22) | 10,302,531 | 1,592,034 | 8,644,393
Less: Cash and bank balances (Note 16) | (6,447,538) | (996,328) | (6,390,918)
Net debts | 6,124,771 | 946,451 | 4,368,528
Equity attributable to equity holders of the parent | 9,014,624 | 1,393,016 | 8,767,529
Total capital and net debts | ¥ 15,139,395 | $ 2,339,467 | ¥ 13,136,057

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