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Prepaid Operating Leases - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Disclosure of detailed information about arrangements involving legal form of lease [Line Items]      
Prepaid operating leases pledged to secure bank facilities ¥ 0 $ 0 ¥ 71,022,000
Bottom of range [Member]      
Disclosure of detailed information about arrangements involving legal form of lease [Line Items]      
Land use rights terms 15 years    
Top of range [Member]      
Disclosure of detailed information about arrangements involving legal form of lease [Line Items]      
Land use rights terms 50 years