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Accounts Receivable (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2012
CNY (¥)
Receivables [Abstract]            
Accounts receivable $ 635,526 ¥ 4,116,819   ¥ 3,758,324    
Allowance for doubtful accounts (29,263) (189,563) $ (14,492) (93,877) ¥ (43,814) ¥ (5,768)
Accounts receivable, net $ 606,263 ¥ 3,927,256   ¥ 3,664,447