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Investments (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Other Long-term Investments | Equity Investments      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Available-for-sale investments, cost or amortized cost   ¥ 322,269 ¥ 124,000
Available-for-sale investments, gross unrealized gains (losses)   (45,304) (8,079)
Available-for-sale investments noncurrent, fair value $ 42,756 276,965 115,921
Other Long-term Investments | Fixed-rate Investments      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Long-term held-to-maturities investments, cost or amortized cost   1,838,953 545,930
Held-to-maturity investments, gross unrecognized holding losses   (32,507) (14,612)
Held-to-maturity investments, fair value 278,867 1,806,446 531,318
Other Long-term Investments | Debt Investment      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Available-for-sale investments, cost or amortized cost     272,680
Available-for-sale investments noncurrent, fair value     272,680
Short-term Investments | Equity Investments      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Available-for-sale investments, cost or amortized cost   600,543 42,137
Available-for-sale investments, gross unrealized gains (losses)   142,075 3,371
Available-for-sale investments current, fair value 114,640 742,618 45,508
Short-term Investments | Fixed-rate Investments      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Short-term held-to-maturity investments, cost or amortized cost   36,942,840 38,159,394
Held-to-maturity investments, gross unrecognized holding gains   197,848 104,718
Held-to-maturity investments, gross unrecognized holding losses   (6,592) (15,389)
Held-to-maturity investments, fair value 5,732,517 37,134,096 38,248,723
Available-for-sale investments, cost or amortized cost   6,872,077 2,854,682
Available-for-sale investments, gross unrealized gains (losses)   86,322 10,414
Available-for-sale investments current, fair value 1,074,192 6,958,399 2,865,096
Short-term Investments | Adjustable-rate Debt Investments      
Amortized cost, Gain (loss) and Fair value on Investments [Line Items]      
Short-term held-to-maturity investments, cost or amortized cost     60,290
Held-to-maturity investments, gross unrecognized holding losses     (771)
Held-to-maturity investments, fair value     59,519
Available-for-sale investments, cost or amortized cost   13,137,500 1,568,812
Available-for-sale investments, gross unrealized gains (losses)   187,885 (269)
Available-for-sale investments current, fair value $ 2,057,085 ¥ 13,325,385 ¥ 1,568,543