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Consolidated Schedule of Investments (Parenthetical)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Change in deferred interest rate 1.75%us-gaap_DebtInstrumentInterestRateIncreaseDecrease  
Corporacion Prodesa S.R.L. [Member]    
Change in deferred interest rate 1.75%us-gaap_DebtInstrumentInterestRateIncreaseDecrease
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Corporacion Prodesa S.R.L. [Member] | Maximum [Member]    
Change in deferred interest rate 2.50%us-gaap_DebtInstrumentInterestRateIncreaseDecrease
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= tgif_CorporacionProdesaSRLMember
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= us-gaap_MaximumMember		  
Senior Secured Trade Finance Participations [Member]    
Grace period relative to maturity date for trade finance borrowers 30 days  
Secured Mezzanine Term Loan [Member] | Indonesia [Member] | Consumer Electronics [Member] | PT Indah Global Semesta (IGS) [Member]    
Extended loan period   3 years
Loan interval   12 months