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Long Term Retention Plan - Long Term Retention Plans Accrued Compensation Expense (Detail) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Long Term Retention Plan 2009 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | $ 709,758 | $ (497,895) | $ 1,117,678 | $ 179,924
Long Term Retention Plan 2010 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | 624,140 | (51,239) | 1,017,936 | 532,918
Long Term Retention Plan 2011 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | 595,513 | 119,814 | 1,006,713 | 686,876
Long Term Retention Plan 2012 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | $ 657,381 | $ 359,637 | $ 1,155,216 | $ 792,088

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