Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 15, 2019	Jun. 29, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	International Money Express, Inc.
Entity Central Index Key	0001683695
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		36,182,783
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY