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Cash and Bank Balances - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
Disclosure Of Detailed Cash and Cash Equivalents Short Term Bank Deposits Current Restricted Cash and Long Term Bank Deposits [Line Items]          
Restricted cash used as collateral by the banks for the issuance of bills to suppliers ¥ 45,288   ¥ 36,000   $ 7,155
Restricted money relates to retention money deposited in a joint signatory account with the buyer of subsidiaries 9,521       1,504
Undrawn borrowing facilities 474,384   318,565   $ 74,949
Loan commitment fee incurred ¥ 179 $ 28 ¥ 392 ¥ 368  
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 0.87%   0.86%   0.87%
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%   2.10%   3.28%