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Cash and Cash Equivalents - Additional Information (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items]          
Restricted cash used as collateral by the banks for the issuance of bills to suppliers ¥ 231.1   ¥ 31.6   $ 32.6
Restricted money relates to retention money deposited in a joint signatory account with the buyer of subsidiaries     40.1    
Undrawn borrowing facilities 295.0   492.8   $ 41.6
Loan commitment fee incurred ¥ 0.2   ¥ 0.2 ¥ 0.2  
Short term deposits maturity 3 months 3 months      
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 on bank deposits 1.50%   1.30%   1.50%
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 on bank deposits 3.15%   3.28%   3.15%
Loan commitment fee incurred | $   $ 0.1