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Investment in Joint Ventures - Interest in Joint Ventures (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Copthorne Hotel Qingdao Co Ltd [Member] |  |
Disclosure of joint ventures [Line Items] |  |
Principal activities | Owns and operates a hotel in Qingdao, PRC |
Place of incorporation | People's Republic of China |
Percentage of interest held |  | 30.10%
HL Heritage Sdn Bhd [Member] |  |
Disclosure of joint ventures [Line Items] |  |
Principal activities | Property development and property investment holdings |
Place of incorporation | Malaysia |
Percentage of interest held | 30.10% | 30.10%
Shanghai Hengshan Equatorial Hotel Management Co., Ltd [Member] |  |
Disclosure of joint ventures [Line Items] |  |
Principal activities | Hotel and property management |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Percentage of interest held | 24.60% | 24.60%
Y & C Engine Co., Ltd. [Member] |  |
Disclosure of joint ventures [Line Items] |  |
Principal activities | Manufacture and sale of heavy duty diesel engines, spare parts and after-sales services |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Percentage of interest held | 34.40% | 34.40%
Guangxi Yineng IOT Science and Technology Co Ltd [Member] |  |
Disclosure of joint ventures [Line Items] |  |
Principal activities | Design, development, management and marketing of an electronic operations management platform |
Place of incorporation | People's Republic of China |
Place of business | People's Republic of China |
Percentage of interest held | 15.30% | 15.30%
MTU Yuchai Power Co., Ltd [Member] |  |
Disclosure of joint ventures [Line Items] |  |
Principal activities | Manufacture off-road diesel engines |
Place of incorporation | People's Republic of China |
Place of business | of China |
Percentage of interest held | 38.20% |

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