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Notes Payable - Summary of Components of Total Debt (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total debt $ 109,544,049us-gaap_NotesAndLoansPayable $ 89,424,313us-gaap_NotesAndLoansPayable
Chambers Credit Agreement [Member]    
Debt Instrument [Line Items]    
Note Payable   50,000,000us-gaap_NotesPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= teng_ChambersCreditAgreementMember
Termination Fee Debt Discount - Chambers Credit Agreement   (1,235,294)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= teng_ChambersCreditAgreementMember
PIK Contingent Interest Expense [Member]    
Debt Instrument [Line Items]    
Interest Expense   2,530,050us-gaap_InterestPayableCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= teng_PikContingentInterestExpenseMember
Chambers Credit Agreement-February 2013 [Member]    
Debt Instrument [Line Items]    
Note Payable   25,000,000us-gaap_NotesPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= teng_AmendedAndRestatedCreditAgreementFebruaryTwoThousandThirteenMember
Termination Fee Chambers Credit Agreement [Member]    
Debt Instrument [Line Items]    
Payable   6,784,626us-gaap_AccountsPayableCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= teng_TerminationFeeMember
Termination Fee Debt Discount - Chambers Credit Agreement   (3,940,659)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= teng_TerminationFeeMember
PIK Interest Fee-Chambers Credit Agreement [Member]    
Debt Instrument [Line Items]    
Payable   375,000us-gaap_AccountsPayableCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= teng_PikInterestFeeMember
PIK Interest-Chambers Credit Agreement[Member]    
Debt Instrument [Line Items]    
Payable   2,186,037us-gaap_AccountsPayableCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= teng_PikInterestMember
Chambers Credit Agreement -December 2013 [Member]    
Debt Instrument [Line Items]    
Note Payable   7,500,000us-gaap_NotesPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= teng_AmendedAndRestatedCreditAgreementDecemberTwoThousandThirteenMember
Other Loans-Related Party [Member]    
Debt Instrument [Line Items]    
Loan Payable   205,314us-gaap_OtherLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_OtherLoansRelatedPartyMember
Other Loans-Vehicles [Member]    
Debt Instrument [Line Items]    
Loan Payable 4,402us-gaap_OtherLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_OtherLoansVehiclesMember
19,239us-gaap_OtherLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= teng_OtherLoansVehiclesMember
Morgan Stanley Credit Agreement-Morgan Stanley Tranche A [Member]    
Debt Instrument [Line Items]    
Note Payable 112,500,000us-gaap_NotesPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= teng_AsdCreditAgreementMorganStanleyTrancheMember
 
Morgan Stanley Credit Agreement-Morgan Stanley PIK Fee [Member]    
Debt Instrument [Line Items]    
Note Payable 593,750us-gaap_NotesPayableToBank
/ us-gaap_LongtermDebtTypeAxis
= teng_AsdCreditAgreementMorganStanleyPikFeeMember
 
Morgan Stanley Credit Agreement-Morgan Stanley NPI [Member]    
Debt Instrument [Line Items]    
Net Profits Interest $ (3,554,103)teng_NotesPayableNetProfitsInterest
/ us-gaap_LongtermDebtTypeAxis
= teng_AsdCreditAgreementMorganStanleyNpiMember