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Business Combinations, Goodwill and Intangible Assets (Details 2) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Brazil [Member]
Dec. 31, 2011
Brazil [Member]
Mar. 31, 2012
Argentina [Member]
Dec. 31, 2011
Argentina [Member]
Mar. 31, 2012
Chile [Member]
Dec. 31, 2011
Chile [Member]
Mar. 31, 2012
Mexico [Member]
Dec. 31, 2011
Mexico [Member]
Mar. 31, 2012
Venezuela [Member]
Dec. 31, 2011
Venezuela [Member]
Dec. 31, 2010
Venezuela [Member]
Mar. 31, 2012
Colombia [Member]
Dec. 31, 2011
Colombia [Member]
Mar. 31, 2012
Other Countries [Member]
Dec. 31, 2011
Other Countries [Member]
Goodwill [Line Items]                                  
Balance, beginning of year $ 62,093,948 $ 60,496,314 $ 11,663,443 $ 13,130,649 $ 21,583,774 $ 23,364,326 $ 6,577,459 $ 7,296,888 $ 10,621,839 $ 5,025,623 $ 4,846,030 $ 4,846,030 $ 4,846,030 $ 5,367,526 $ 5,448,068 $ 1,433,877 $ 1,384,730
Purchase of Autoplaza.com   6,663,045               6,663,045              
Effect of exchange rates changes 1,841,539 (5,065,411) 343,739 (1,467,206) (369,670) (1,780,552) 428,566 (719,429) 945,932 (1,066,829)       475,320 (80,542) 17,652 49,147
Balance, end of the period $ 63,935,487 $ 62,093,948 $ 12,007,182 $ 11,663,443 $ 21,214,104 $ 21,583,774 $ 7,006,025 $ 6,577,459 $ 11,567,771 $ 10,621,839 $ 4,846,030 $ 4,846,030 $ 4,846,030 $ 5,842,846 $ 5,367,526 $ 1,451,529 $ 1,433,877