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Estimated Useful Lives of Property and Equipment (Detail)
12 Months Ended
Dec. 31, 2012
Leasehold Improvements
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful lives Estimated Useful Lives in Years Shorter of the lease term or expected useful life
Furniture, fixtures, and equipment | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful lives 3 years
Furniture, fixtures, and equipment | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful lives 5 years
Motor Vehicles
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful lives 5 years
Software | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful lives 2 years
Software | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful lives 5 years