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Business combinations, Goodwill and Intangible assets - Table Showing Changes in Carrying Amount of Goodwill (Detail) (USD $) | 6 Months Ended | 12 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Mar. 22, 2013 | Jun. 30, 2013 Brazil [Member] | Dec. 31, 2012 Brazil [Member] | Jun. 30, 2013 Argentina [Member] | Dec. 31, 2012 Argentina [Member] | Jun. 30, 2013 Chile [Member] | Dec. 31, 2012 Chile [Member] | Jun. 30, 2013 Mexico [Member] | Dec. 31, 2012 Mexico [Member] | Jun. 30, 2013 Venezuela [Member] | Dec. 31, 2011 Venezuela [Member] | Jun. 30, 2013 Colombia [Member] | Dec. 31, 2012 Colombia [Member] | Jun. 30, 2013 Other Countries [Member] | Dec. 31, 2012 Other Countries [Member]
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 60,366,063 | $ 62,093,948 | $ 2,668,661 | $ 10,706,281 | $ 11,663,443 | $ 18,889,094 | $ 21,583,774 | $ 7,115,211 | $ 6,577,459 | $ 11,404,780 | $ 10,621,839 | $ 4,846,030 | $ 4,846,030 | $ 5,897,136 | $ 5,367,526 | $ 1,507,531 | $ 1,433,877
Business acquisition | 2,668,661 |  |  | 1,307,644 |  | 659,159 |  |  |  | 186,806 |  | 405,637 |  | 69,385 |  | 40,030 |
Effect of exchange rates change | (3,476,701) | (1,727,885) |  | (896,673) | (957,162) | (1,561,458) | (2,694,680) | (337,502) | 537,752 | (63,521) | 782,941 | (20,178) |  | (477,030) | 529,610 | (120,339) | 73,654
Balance, end of the period | $ 59,558,023 | $ 60,366,063 | $ 2,668,661 | $ 11,117,252 | $ 10,706,281 | $ 17,986,795 | $ 18,889,094 | $ 6,777,709 | $ 7,115,211 | $ 11,528,065 | $ 11,404,780 | $ 5,231,489 | $ 4,846,030 | $ 5,489,491 | $ 5,897,136 | $ 1,427,222 | $ 1,507,531

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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