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Summary of Significant Accounting Policies - Assets, Liabilities and Net Assets of the Company's Venezuelan Subsidiaries (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Significant Accounting Policies [Line Items]          
Net revenues $ 112,183,360 $ 88,844,059 $ 214,909,107 $ 172,580,065  
Assets 529,582,232   529,582,232   478,669,276
Liabilities (216,678,170)   (216,678,170)   (184,855,650)
Venezuelan operations [Member]
          
Significant Accounting Policies [Line Items]          
Net revenues     32,694,097 23,658,890  
Assets 74,128,243 62,938,728 74,128,243 62,938,728  
Liabilities (28,719,423) (22,652,965) (28,719,423) (22,652,965)  
Net Assets $ 45,408,820 $ 40,285,763 $ 45,408,820 $ 40,285,763