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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

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