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Summary of Significant Accounting Policies - Business Segment (Details) (USD $)
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3 Months Ended | |
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Mar. 31, 2013
region
segment
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Mar. 31, 2012
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| Segment Reporting Information [Line Items] | ||
| Number of reportable segments | 4 | |
| Number of U.S. regions reported in aggregate | 4 | |
| Income before taxes and unallocated corporate expenses | $ 5,214,545 | $ 4,246,232 |
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All Other [Member]
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| Segment Reporting Information [Line Items] | ||
| Number of U.S. regions reported in aggregate | 4 | |
| Income before taxes and unallocated corporate expenses | 5,214,545 | 4,246,232 |
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Unallocated Amount to Segment [Member]
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| Segment Reporting Information [Line Items] | ||
| Indirect expenses | $ 11,419,945 | $ 12,658,134 |
| X | ||||||||||
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- Definition
Income before Income Taxes and Unallocated Corporate Expenses No definition available.
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- Definition
Indirect Expenses No definition available.
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- Definition
Number of Regions Reported in Aggregate No definition available.
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| X | ||||||||||
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- Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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| X | ||||||||||
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- Details
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