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Segment Reporting - Financial Performance of Company's Reporting Segments (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Net revenues | $ 115,382,319 | $ 102,725,747
Direct costs | (61,560,002) | (57,462,171)
Direct contribution | 53,822,317 | 45,263,576
Operating expenses and indirect costs of net revenues | (19,821,230) | (16,692,392)
Income from operations | 34,001,087 | 28,571,184
Other income (expenses): |  |
Interest income and other financial gains | 3,035,630 | 3,394,006
Interest expense and other financial losses | (1,027,180) | (360,352)
Foreign currency gain | 3,093,471 | (6,249,714)
Other losses, net |  | (3,733)
Net income before income / asset tax expense | 39,103,008 | 25,351,391
Brazil [Member] |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 52,434,098 | 47,765,683
Direct costs | (30,516,894) | (30,993,544)
Direct contribution | 21,917,204 | 16,772,139
Operating expenses and indirect costs of net revenues |  |
Income from operations |  |
Other income (expenses): |  |
Interest income and other financial gains |  |
Interest expense and other financial losses |  |
Foreign currency gain |  |
Other losses, net |  |
Net income before income / asset tax expense |  |
Argentina [Member] |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 27,961,744 | 25,620,747
Direct costs | (16,915,878) | (13,475,710)
Direct contribution | 11,045,866 | 12,145,037
Operating expenses and indirect costs of net revenues |  |
Income from operations |  |
Other income (expenses): |  |
Interest income and other financial gains |  |
Interest expense and other financial losses |  |
Foreign currency gain |  |
Other losses, net |  |
Net income before income / asset tax expense |  |
Mexico [Member] |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 8,083,185 | 7,790,301
Direct costs | (4,577,716) | (4,116,828)
Direct contribution | 3,505,469 | 3,673,473
Operating expenses and indirect costs of net revenues |  |
Income from operations |  |
Other income (expenses): |  |
Interest income and other financial gains |  |
Interest expense and other financial losses |  |
Foreign currency gain |  |
Other losses, net |  |
Net income before income / asset tax expense |  |
Venezuela [Member] |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 19,356,587 | 15,130,551
Direct costs | (5,634,981) | (6,008,108)
Direct contribution | 13,721,606 | 9,122,443
Operating expenses and indirect costs of net revenues |  |
Income from operations |  |
Other income (expenses): |  |
Interest income and other financial gains |  |
Interest expense and other financial losses |  |
Foreign currency gain |  |
Other losses, net |  |
Net income before income / asset tax expense |  |
Other Countries [Member] |  |
Segment Reporting Information [Line Items] |  |
Net revenues | 7,546,705 | 6,418,465
Direct costs | (3,914,533) | (2,867,981)
Direct contribution | 3,632,172 | 3,550,484
Operating expenses and indirect costs of net revenues |  |
Income from operations |  |
Other income (expenses): |  |
Interest income and other financial gains |  |
Interest expense and other financial losses |  |
Foreign currency gain |  |
Other losses, net |  |
Net income before income / asset tax expense |  |

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