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Cash and Cash Equivalents - Additional Information (Detail)
¥ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
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 ¥ 171.1   ¥ 231.1   $ 26.4
Undrawn borrowing facilities 491.9   295.0   76.0
Loan commitment fee incurred | ¥ 0.1   0.2 ¥ 0.2  
Fixed deposits held with related party ¥ 130.8   ¥ 0.0   $ 20.2
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 0.10%   1.50%   0.10%
Loan commitment fee incurred | $   $ 0.1      
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 1.55%   3.15%   1.55%