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Investments - Long-term Investments (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Investment [Line Items]      
Cost method investments ¥ 1,002,539 $ 154,087 ¥ 869,741
Equity method investments 149,969 23,050 100,063
Available-for-sale debt security 182 28 7,353
Total ¥ 1,152,690 $ 177,165 ¥ 977,157