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Related Parties - Additional Information (Detail)
¥ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Related Party Transaction [Line Items]              
Accrued interest $ 2,697,000   $ 2,274,000        
LB Co [Member]              
Related Party Transaction [Line Items]              
Purchases     955,000   $ 1,270,000    
LB Co paid Corporation for administrative services         $ 72,000    
Net amount payable 0   0        
ATR [Member]              
Related Party Transaction [Line Items]              
Purchases 7,752,000 ¥ 52,418 6,362,000 ¥ 42,403      
LB Co paid Corporation for administrative services 296,000 ¥ 1,929 899,000 6,237      
Loan outstanding $ 5,325,000         ¥ 34,655  
Debt, interest rate 5.00%         5.00%  
Accrued interest $ 2,682,000   2,265,000     ¥ 17,457 ¥ 15,730
Debt, maturity date 2008 2008          
Debt, renewal period 1 year 1 year          
Sales $ 8,564,000 ¥ 57,909 5,922,000 ¥ 39,468      
Due from related parties $ 0   $ 0        
ATR [Member] | Minimum [Member]              
Related Party Transaction [Line Items]              
Interest accrual period 3 years 3 years          
ATR [Member] | Maximum [Member]              
Related Party Transaction [Line Items]              
Interest accrual period 5 years 5 years