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Related Party Disclosures - Significant Transactions with Related Parties (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Disclosure of transactions between related parties [Line Items] |  |  |  |
Materials/engines to State Holding Company, its subsidiaries and affiliates | ¥ 710 | $ 112 |  |
Associates and Joint Ventures [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Diesel engines and materials to associates and joint ventures | 412,591 | 65,186 | ¥ 219,724 | ¥ 156,444
Purchase of materials and supplies/engines | 914,211 | 144,439 | 308,610 | 90,354
Charged by joint ventures for service provided | 2,543 | 402 | 2,121 |
Joint Ventures [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Charged to a joint venture for service provided | 14,241 | 2,250 |  |
Sales of an intangible asset to a joint venture | 220,000 | 34,758 |  |
State Holding Company Limited [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Disposal of shareholding in an associate to State Holding Company | 1,833 | 290 |  |
State Holding Company Limited [Member] | Subsidiaries and affiliates[Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Materials/engines to State Holding Company, its subsidiaries and affiliates | 455,061 | 71,896 | 447,509 | 516,679
Hospitality and restaurant service charged to State Holding Company, its subsidiaries and affiliates | 4,454 | 704 | 4,761 | 3,247
Purchase of materials and supplies/engines | 1,221,421 | 192,976 | 1,028,358 | 1,181,852
Delivery expense charged by subsidiaries of State Holding Company | 192,399 | 30,398 | 143,077 | 164,690
Storage, distribution and handling expenses charged by a subsidiary of State Holding Company | 18,007 | 2,845 | 50,181 | 30,462
Leasing expenses charged by State Holding Company | 8,676 | 1,371 | 4,715 | 12,951
Consultancy fees charged by State Holding Company | 12,264 | 1,938 | 10,026 |
General and administrative expenses | 7,951 | 1,256 | 4,283 | 3,141
Charged to a joint venture for service provided | 21,274 | 3,361 | 8,873 |
Rental income charged to State Holding Company and its subsidiaries | 4,483 | 708 | 5,454 | 619
Purchases of vehicles/machineries from State Holding Company and its subsidiary | 52,443 | 8,286 |  | 1,963
Purchases of additional shareholding in a subsidiary from State Holding Company | 1,335 | 211 |  | 4,170
State Holding Company Limited [Member] | Associates and Joint Ventures [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Property management service charged by an associate/ a subsidiary of SHC | 22,212 | 3,509 | 20,976 | 23,359
Hong Leong Asia Limited [Member] | Subsidiaries [Member] |  |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |  |
Consultancy fees charged by State Holding Company | 34 | 5 | 34 | 32
General and administrative expenses | ¥ 6,913 | $ 1,092 | ¥ 6,887 | ¥ 6,271

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