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Reconciliations of Total Segment Operating Income to Income Before Taxes (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total segment operating income $ 7,829,497 $ 13,496,262 $ 13,089,146 $ 37,172,616
Corporate costs (196,294) (107,653) (878,844) (3,519,714)
Income from operations 7,633,203 13,388,609 12,210,302 33,652,902
Other income (expense) 30,660 (13,009) 75,138 20,819
Income before taxes $ 7,663,863 $ 13,375,600 $ 12,285,440 $ 33,673,721