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Accounts Receivable (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Receivables [Abstract]            
Accounts receivable $ 617,417 ¥ 4,286,725   ¥ 4,116,549    
Allowance for doubtful accounts (25,551) (177,401) $ (27,303) (189,563) ¥ (93,877) ¥ (43,814)
Accounts receivable, net $ 591,866 ¥ 4,109,324   ¥ 3,926,986