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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

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