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Investment in Joint Ventures - Share of Results of Joint Ventures and Carrying Amount of Investment to Joint Ventures (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure of joint ventures [Line Items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | ¥ 10,082 | $ 1,593 | ¥ (4,068) | ¥ (2,936) |
Carrying amount of the investment | 196,102 |  | 176,351 |  | $ 30,983
Y & C Engine Co., Ltd. [Member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | 17,755 | 2,805 | 2,039 | (8,978) |
Carrying amount of the investment | 122,235 |  | 169,064 |  | 19,312
Copthorne Hotel Qingdao Co Ltd [Member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax |  |  | (4,465) | 6,941 |
MTU Yuchai Power Co., Ltd [Member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | (8,487) | (1,341) |  |  |
Carrying amount of the investment | 66,513 |  |  |  | 10,509
Other Joint Ventures [Member] |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |
Share of (loss)/profit of joint ventures, net of tax | 814 | $ 129 | (1,642) | ¥ (899) |
Carrying amount of the investment | ¥ 7,354 |  | ¥ 7,287 |  | $ 1,162

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- Definition The amount of investments in joint ventures. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2016-01-13 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2016-03-30&anchor=para_10&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The entity's share of the profit (loss) of joint ventures accounted for using the equity method. [Refer: Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_85&doctype=Standard -URIDate 2016-03-31 + Details
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