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Notes Payable - Summary of Components of Total Debt (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total debt $ 104,325,704us-gaap_NotesPayable $ 89,424,313us-gaap_NotesPayable
Unamortized Original Issuance Discount - ASD   (1,235,294)us-gaap_DebtInstrumentUnamortizedDiscount
Termination Fee Debt Discount - A&R   (3,940,659)teng_TerminationFeeDebtDiscount
ASD Credit Agreement [Member]    
Debt Instrument [Line Items]    
Total debt   50,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_AmericanShaleDevelopmentCreditMember
PIK Contingent Interest Expense [Member]    
Debt Instrument [Line Items]    
Total debt   2,530,050us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_PikContingentInterestExpenseMember
A&R Credit Agreement-February 2013 [Member]    
Debt Instrument [Line Items]    
Total debt   25,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_AmendedAndRestatedCreditAgreementFebruaryTwoThousandThirteenMember
Termination Fee - A&R [Member]    
Debt Instrument [Line Items]    
Total debt   6,784,626us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_TerminationFeeMember
PIK Interest Fee-ASD [Member]    
Debt Instrument [Line Items]    
Total debt   375,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_PikInterestFeeMember
PIK Interest - A&R [Member]    
Debt Instrument [Line Items]    
Total debt   2,186,037us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_PikInterestMember
A&R Credit Agreement -December 2013 [Member]    
Debt Instrument [Line Items]    
Total debt   7,500,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_AmendedAndRestatedCreditAgreementDecemberTwoThousandThirteenMember
Other Loans - Related Party [Member]    
Debt Instrument [Line Items]    
Total debt   205,314us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_OtherLoansRelatedPartyMember
Other Loans - Vehicles [Member]    
Debt Instrument [Line Items]    
Total debt 8,189us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_OtherLoansVehiclesMember
19,239us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_OtherLoansVehiclesMember
ASD Credit Agreement - Morgan Stanley Tranche A [Member]    
Debt Instrument [Line Items]    
Total debt 107,500,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_AsdCreditAgreementMorganStanleyTrancheaMember
 
ASD Credit Agreement - Morgan Stanley PIK Fee [Member]    
Debt Instrument [Line Items]    
Total debt 593,750us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_AsdCreditAgreementMorganStanleyPikFeeMember
 
ASD Credit Agreement - Morgan Stanley NPIi [Member]    
Debt Instrument [Line Items]    
Total debt $ (3,776,235)us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_AsdCreditAgreementMorganStanleyNpiMember