Commitments and Contingencies (Details) - USD ($) $ in Millions				1 Months Ended
	Apr. 17, 2020	Jan. 23, 2020	Nov. 13, 2019	Jul. 31, 2020	Jun. 30, 2021
Surety Bond
Loss Contingencies [Line Items]
Debt outstanding					$ 265.3
Lanzo Trenchless Technologies vs. Limbach Company LLC | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 0.4
Bernards Bros vs. Limbach Holdings, Inc. | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 3.0
LA Excavating, Inc. vs. Limbach Company LP | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 1.0
Kimball Construction Co., Inc. vs. Limbach Company LLC | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value				$ 1.7