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Consolidated VIE Included in Accompanying Consolidated Financial Statements (Parenthetical) (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Accounts receivable, allowance for doubtful accounts $ 10,855 ¥ 70,627 ¥ 80,313