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Commitments and Contingencies - Future Minimum Payments to Third Parties for the Next Five Years and Thereafter (Detail) (USD $)
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 9,211,764us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 7,825,681us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 7,921,061us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 7,358,375us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 2,088,195us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 6,333,315us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total $ 40,738,391us-gaap_OperatingLeasesFutureMinimumPaymentsDue