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Summary of Unaudited Results of Operations and Financial Position of Equity Investments in Affiliates (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investments In And Advances To Affiliates Schedule Of Investments [Abstract]    
Net operating revenues $ 93,657,544us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 186,777,871us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Net income 22,016,318us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 40,559,684us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
Current assets 20,145,429us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets 44,091,846us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Noncurrent assets 40,297,744us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets 44,668,968us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Total assets 60,443,173us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets 88,760,814us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Current liabilities 13,343,319us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 31,891,679us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Noncurrent liabilities 21,489,753us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities 29,015,316us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
Total liabilities 34,833,073us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities 60,906,995us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
Members' equity $ 25,610,100us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity $ 27,853,819us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity