Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 26, 2018	Jun. 30, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	trilinc
Entity Registrant Name	TriLinc Global Impact Fund LLC
Entity Central Index Key	0001550453
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 0
Class A Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		18,366,611
Class C Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,469,747
Class I Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,629,452
Class W Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		24,555
Class Y Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,116,053
Class Z Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,877,513