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Summary of Significant Accounting Policies - Schedule of Estimated Useful Life of Assets (Detail)
12 Months Ended
Dec. 31, 2014
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life Shorter of lease term or the estimated useful lives of the assets
Minimum [Member] | Electric Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 3 years
Minimum [Member] | Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 3 years
Minimum [Member] | Motor Vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 4 years
Minimum [Member] | Purchased Software [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 3 years
Maximum [Member] | Electric Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 5 years
Maximum [Member] | Office Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 5 years
Maximum [Member] | Motor Vehicles [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 5 years
Maximum [Member] | Purchased Software [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, Estimated useful life 5 years