Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 12, 2020
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Registrant Name	Limbach Holdings, Inc.
Entity Central Index Key	0001606163
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		7,884,202
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false