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Cash and Cash Equivalents - Additional Information (Detail)
¥ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of detailed cash and cash equivalents short term bank deposits current restricted cash and long term bank deposits [line items]          
Long term deposits maturity 12 months 12 months      
Restricted cash used as collateral by the banks for the issuance of bills to suppliers $ 4,700,000   ¥ 45.3   ¥ 31.6
Restricted money relates to retention money deposited in a joint signatory account with the buyer of subsidiaries 6,000,000   9.5   40.1
Undrawn borrowing facilities $ 73,700,000   474.4   ¥ 492.8
Loan commitment fee incurred | ¥   ¥ 0.2 ¥ 0.2 ¥ 0.4  
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 1.30%   0.87%   1.30%
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 3.28%   3.28%   3.28%
Loan commitment fee incurred | $ $ 100,000