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Property and Equipment Net (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Leasehold improvements $ 1,987,265 $ 1,754,027
Furniture, fixtures and equipment 2,953,863 2,425,928
Motor vehicles 741,551 599,433
Software 1,378,745 655,186
Property, Plant and Equipment, Gross, Total 7,061,424 5,434,574
Accumulated depreciation (3,429,370) (1,806,326)
Property Plant And Equipment Net Excluding Construction In Progress, Total 3,632,054 3,628,248
Construction in progress 755,899 808,688
Property and equipment, net $ 4,387,953 $ 4,436,936