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Principal Activities and Organization - Additional Information (Detail)
Mar. 19, 2015
shares
Sep. 30, 2015
shares
Dec. 31, 2014
shares
Oct. 02, 2014
Organization And Principal Business [Line Items]        
Reverse stock split ratio 0.2      
Common stock, shares authorized   200,000,000 200,000,000  
Preferred stock, shares authorized 10,000,000 10,000,000 10,000,000  
Reverse Stock Split [Member]        
Organization And Principal Business [Line Items]        
Common stock, shares increase decrease 1,000,000,000      
Common stock, shares authorized 200,000,000      
Best One Inc [Member] | Interactive Data [Member]        
Organization And Principal Business [Line Items]        
Membership interest acquired       100.00%