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Principal Amount and Unamortized Discount and Debt Issuance Costs (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Debt Disclosure [Abstract]      
Principal amount $ 4,765,399 ¥ 30,869,300 ¥ 21,700,000
Unamortized discount and debt issuance costs (25,809) (167,184) (143,218)
Notes Payable $ 4,739,590 ¥ 30,702,116 ¥ 21,556,782