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Cash and Bank Balances - Summary of Cash and Bank Balances (Parenthetical) (Detail) $ in Thousands | 12 Months Ended |
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Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items] |  |  |
Long-term bank deposits | ¥ 70,000,000 |  | $ 11,060
Bottom of range [Member] |  |  |
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items] |  |  |
Interest rate short term bank deposit | 1.01% | 0.83% |
Top of range [Member] |  |  |
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items] |  |  |
Interest rate short term bank deposit | 1.97% | 1.76% |
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] |  |  |
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items] |  |  |
Long-term bank deposits | ¥ 70,000,000 | ¥ 0 | $ 11,060
Long term deposits maturity | 2 years |  |
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] | Bottom of range [Member] |  |  |
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items] |  |  |
Interest rate long term bank deposit | 2.94% |  |
Guangxi Yuchai Machinery Monopoly Development Company Limited [Member] | Top of range [Member] |  |  |
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items] |  |  |
Interest rate long term bank deposit | 3.15% |  |

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