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Cash and Bank Balances - Summary of Cash and Bank Balances (Parenthetical) (Detail)
$ in Thousands
 12 Months Ended
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%