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Segment reporting - Allocation of Long-Lived Tangible Assets Based on Geography (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | $ 70,562,482 | $ 30,944,145
Total long-lived tangible assets | 80,081,659 | 37,726,222
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | 9,519,177 | 6,782,077
Argentina [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | 33,568,284 | 16,955,438
Brazil [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | 3,459,910 | 2,421,618
Mexico [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | 572,537 | 378,653
Venezuela [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | 29,755,221 | 8,455,816
Other Countries [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Other countries long-lived tangible assets | $ 3,206,530 | $ 2,732,620

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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