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Principal Accounting Policies (Schedule of Estimated Useful Lives of Property and Equipment) (Details)
12 Months Ended
Dec. 31, 2015
Computers and equipment [Member]  
Property and Equipment [Line Items]  
Estimated useful life 3 years
Building [Member] | Minimum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 16 years
Building [Member] | Maximum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 17 years
Furniture and fixtures [Member] | Minimum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 3 years
Furniture and fixtures [Member] | Maximum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 5 years
Vehicles [Member] | Minimum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 3 years
Vehicles [Member] | Maximum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 5 years
Software [Member]  
Property and Equipment [Line Items]  
Estimated useful life 5 years
Leasehold improvements [Member] | Minimum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 1 year
Leasehold improvements [Member] | Maximum [Member]  
Property and Equipment [Line Items]  
Estimated useful life 9 years