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Business combinations, Goodwill and Intangible assets - Composition of Goodwill and Intangible Assets (Detail) (USD $) | Jun. 30, 2013 | Mar. 22, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 59,558,023 | $ 2,668,661 | $ 60,366,063 | $ 62,093,948
Total intangible assets | 11,520,494 |  | 12,060,004 |
Accumulated amortization | (4,802,728) |  | (4,780,139) |
Total intangible assets, net | 6,717,766 |  | 7,279,865 |
Licenses and Others [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 3,563,361 |  | 3,829,668 |
Non-Compete Agreement [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 1,105,573 |  | 1,195,509 |
Customer List [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 1,600,514 |  | 1,708,770 |
Trademarks [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Trademarks | $ 5,251,046 |  | $ 5,326,057 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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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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