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Investments (Detail)
In Thousands, unless otherwise specified
Dec. 31, 2012
Other Long-term Investments
Fixed-rate Investments
CNY
Dec. 31, 2013
Short-term Investments
Fixed-rate Investments
USD ($)
Dec. 31, 2013
Short-term Investments
Fixed-rate Investments
CNY
Dec. 31, 2012
Short-term Investments
Fixed-rate Investments
CNY
Dec. 31, 2013
Short-term Investments
Adjustable-rate Debt Investments
USD ($)
Dec. 31, 2013
Short-term Investments
Adjustable-rate Debt Investments
CNY
Dec. 31, 2012
Short-term Investments
Adjustable-rate Debt Investments
CNY
Dec. 31, 2013
Short-term Investments
Equity Investments
USD ($)
Dec. 31, 2013
Short-term Investments
Equity Investments
CNY
Gain (Loss) on Investments [Line Items]                  
Short-term held-to-maturity investments, amortized cost     19,339,250 17,072,751          
Long-term held-to-maturities investments, amortized cost 513,728                
Held-to-maturity investments, gross unrecognized holding gains 886   51,897 30,886          
Held-to-maturity investments, gross unrecognized holding losses     (21,080) (17,385)          
Held-to-maturity investments, fair value 514,614 3,199,707 19,370,067 17,086,252          
Available-for-sale investments, amortized cost     7,603,087 3,500,945   514,433 17,073   604,878
Available-for-sale investments, gross unrealized gains     24,871 13,454   0 0   648,242
Available-for-sale investments current, fair value   $ 1,260,049 7,627,958 3,514,399 $ 84,978 514,433 17,073 $ 207,001 1,253,120