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Investments in Subsidiaries - Assets and Liabilities and Cash Flow Effect of Disposal of Subsidiaries (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Property, plant and equipment (Note 11) | ¥ 3,824,018 |  |  | $ 604,168 | ¥ 4,127,185
Inventories | 2,572,745 |  |  | 406,475 | 1,663,879
Deferred taxation | 315,390 |  |  | 49,829 | 308,207
Total assets | 21,015,059 |  |  | 3,320,229 | 18,596,506
Payables and accruals | (7,624,496) |  |  | (1,204,616) | (6,981,815)
Provision for taxation | (46,716) |  |  | (7,381) | (47,667)
Deferred taxation | (116,468) |  |  | (18,401) | ¥ (115,758)
Gain on disposal: |  |  |  |  |
Gain (loss) on disposal of the subsidiaries (Note 8.2(b)) | 216,115 | $ 34,145 |  |  |
Less: Retention sum receivables | (30,000) |  |  | (4,740) |
Net cash inflow on disposal of the subsidiaries | 341,602 | 53,971 | ¥ 170,703 |  |
Xiamen Yuchai Diesel Engines Company Limited [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Property, plant and equipment (Note 11) |  |  | 66,597 |  |
Land use rights |  |  | 17,661 |  |
Inventories |  |  | 6,354 |  |
Trade receivables and other receivables |  |  | 111,651 |  |
Deferred taxation |  |  | 244 |  |
Cash and bank balances |  |  | 18,797 |  |
Total assets |  |  | 221,304 |  |
Payables and accruals |  |  | (17,161) |  |
Provision for taxation |  |  | (996) |  |
Carrying value of net assets |  |  | 203,147 |  |
Gain on disposal: |  |  |  |  |
Total consideration |  |  | 189,500 |  |
Net assets derecognized |  |  | (203,147) |  |
Gain (loss) on disposal of the subsidiaries (Note 8.2(b)) |  |  | (13,647) |  |
Cash and bank balances of the subsidiaries |  |  | (18,797) |  |
Net cash inflow on disposal of the subsidiaries |  |  | ¥ 170,703 |  |
LKN Investment International Pte. Ltd ("LKNII") and LKNII's wholly-owned subsidiary, Shanghai Hutai Real Estate Development Co., Ltd [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Property, plant and equipment (Note 11) | 104,844 |  |  | 16,565 |
Trade receivables and other receivables | 3,257 |  |  | 514 |
Cash and bank balances | 9,153 |  |  | 1,446 |
Total assets | 117,254 |  |  | 18,525 |
Payables and accruals | (3,737) |  |  | (590) |
Provision for taxation | (44) |  |  | (7) |
Deferred taxation | (588) |  |  | (93) |
Carrying value of net assets | 112,885 |  |  | 17,835 |
Gain on disposal: |  |  |  |  |
Total consideration | (395,000) | (62,407) |  |  |
Less: Cost of disposal | (47,532) | (7,510) |  |  |
Total consideration less cost of disposal | 347,468 | 54,897 |  |  |
Net assets derecognized | (112,885) |  |  | (17,835) |
Realization of foreign translation reserves upon disposal | (18,468) | (2,917) |  |  |
Gain (loss) on disposal of the subsidiaries (Note 8.2(b)) | 216,115 | 34,145 |  |  |
Total consideration less cost of disposal | 347,468 | 54,897 |  |  |
Add: Transaction cost unpaid | 33,287 | 5,260 |  |  |
Less: Retention sum receivables | (30,000) |  |  | $ (4,740) |
Cash and bank balances of the subsidiaries | (9,153) | (1,446) |  |  |
Net cash inflow on disposal of the subsidiaries | ¥ 341,602 | $ 53,971 |  |  |

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