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Segments (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Financial performance of the Company's reporting segments    
Net revenues $ 83,736,006 $ 61,459,668
Direct costs (45,175,788) (32,389,120)
Direct contribution 38,560,218 29,070,548
Operating expenses and indirect costs of net revenues (13,629,474) (9,779,392)
Income from operations 24,930,744 19,291,156
Other income (expenses):    
Interest income and other financial gains 3,088,560 1,873,768
Interest expense and other financial charges (77,317) (628,950)
Foreign currency loss (1,032,978) (500,655)
Other income (losses), net (4,252) 20,344
Net income before income / asset tax expense 26,904,757 20,055,663
Brazil [Member]
    
Financial performance of the Company's reporting segments    
Net revenues 42,164,654 34,723,195
Direct costs (25,743,214) (20,075,608)
Direct contribution 16,421,440 14,647,587
Argentina [Member]
    
Financial performance of the Company's reporting segments    
Net revenues 18,116,469 10,579,932
Direct costs (8,122,935) (4,427,098)
Direct contribution 9,993,534 6,152,834
Mexico [Member]
    
Financial performance of the Company's reporting segments    
Net revenues 6,583,865 5,234,333
Direct costs (3,646,637) (2,716,359)
Direct contribution 2,937,228 2,517,974
Venezuela [Member]
    
Financial performance of the Company's reporting segments    
Net revenues 11,241,572 6,770,453
Direct costs (4,847,335) (3,069,739)
Direct contribution 6,394,237 3,700,714
Other Countries [Member]
    
Financial performance of the Company's reporting segments    
Net revenues 5,629,446 4,151,755
Direct costs (2,815,667) (2,100,316)
Direct contribution $ 2,813,779 $ 2,051,439