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Business combinations, Goodwill and Intangible assets - Definitive Purchase Price Allocation for Acquisition (Detail)
Jun. 30, 2013
USD ($)
Mar. 22, 2013
USD ($)
Mar. 22, 2013
ARS
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Business Combinations [Abstract]          
Net assets acquired   $ 237,891      
Goodwill 59,558,023 2,668,661   60,366,063 62,093,948
Purchase price   2,906,552      
Escrow for employment relationship   547,945      
Aggregate price paid   $ 3,454,497 17,652,480