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Commitments and Contingencies - Future Minimum Lease Payments Under Finance Lease Together With Present Value of Net Minimum Lease Payments (Parenthetical) (Detail)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Disclosure of finance lease and operating lease by lessee [Line Items]      
Less: Amount representing finance charges [1] [1] ¥ 5,000
Top of range [Member]      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Less: Amount representing finance charges ¥ 1,000 $ 1,000  
[1] Less than RMB 1 (US$1)