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Summary of Significant Accounting Policies - Analysis of Different Types of Revenues (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting [Abstract]      
Subscription revenue $ 98,189us-gaap_SubscriptionRevenue $ 86,733us-gaap_SubscriptionRevenue $ 51,055us-gaap_SubscriptionRevenue
Advertising revenue 38,378us-gaap_AdvertisingRevenue 48,028us-gaap_AdvertisingRevenue 61,795us-gaap_AdvertisingRevenue
Other internet value-added services 46,320us-gaap_OtherSalesRevenueNet 45,483us-gaap_OtherSalesRevenueNet 35,350us-gaap_OtherSalesRevenueNet
Total $ 182,887us-gaap_Revenues $ 180,244us-gaap_Revenues $ 148,200us-gaap_Revenues