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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, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | $ 1,165,305 | $ 2,586,792 | $ 1,931,082 | $ 4,297,543
Long Term Retention Plan 2009 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | (88,128) | 709,758 | (439,050) | 1,117,678
Long Term Retention Plan 2010 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | (7,680) | 624,140 | (190,575) | 1,017,936
Long Term Retention Plan 2011 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | 43,895 | 595,513 | (57,217) | 1,006,713
Long Term Retention Plan 2012 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | 90,931 | 657,381 | 89,984 | 1,155,216
Long Term Retention Plan 2013 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | 435,358 |  | 1,039,219 |
Long Term Retention Plan 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term retention plan | $ 690,929 |  | $ 1,488,721 |

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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