Segments (Details 2) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Allocation of the goodwill and intangible assets based on geography
US intangible assets	$ 0	$ 3,507
Other countries goodwill and intangible assets	69,571,885	64,633,974
Total goodwill and intangible assets	69,571,885	64,637,481
Argentina [Member]
Allocation of the goodwill and intangible assets based on geography
Other countries goodwill and intangible assets	23,044,009	24,825,718
Brazil [Member]
Allocation of the goodwill and intangible assets based on geography
Other countries goodwill and intangible assets	11,813,433	13,137,658
Mexico [Member]
Allocation of the goodwill and intangible assets based on geography
Other countries goodwill and intangible assets	13,898,219	5,043,335
Venezuela [Member]
Allocation of the goodwill and intangible assets based on geography
Other countries goodwill and intangible assets	6,595,409	6,595,866
Other Countries [Member]
Allocation of the goodwill and intangible assets based on geography
Other countries goodwill and intangible assets	$ 14,220,815	$ 15,031,397