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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
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