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Related Party Transactions - Significant Related Party Transactions (Detail) - Ping An Group [Member]
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Related Party Transaction [Line Items]        
Significant related party transactions, interest income ¥ 3,564 $ 513 ¥ 0 ¥ 0
Sales of New Vehicles [Member]        
Related Party Transaction [Line Items]        
Significant related party transactions, sales 21,938 3,160 0 0
Services [Member]        
Related Party Transaction [Line Items]        
Significant related party transactions, service provided [1] ¥ 21,594 $ 3,110 ¥ 0 ¥ 0
[1] The amount represents rental and property management services and other miscellaneous services provided by Ping An Group.