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Capital Management - Summary of Capital Structure (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
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Disclosure of objectives, policies and processes for managing capital [Abstract] |  |  |
Interest-bearing loans and borrowings (current and non-current) (Note 16(b)) | ¥ 1,626,341 | $ 256,951 | ¥ 910,406
Trade and other payables (current and non-current)(Note 28) | 7,624,496 | 1,204,616 | 6,981,815
Less: Cash and bank balances (Note 23) | (6,029,207) | (952,572) | (4,052,957)
Net debts | 3,221,630 | 508,995 | 3,839,264
Equity attributable to equity holders of the parent | 8,347,562 | 1,318,855 | 7,683,834
Total capital and net debts | ¥ 11,569,192 | $ 1,827,850 | ¥ 11,523,098

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