Commitments and Contingencies Commitments and Contingencies (Details) - USD ($)	Jan. 23, 2020	Nov. 13, 2019	Oct. 12, 2018	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			$ 30,000,000
Other current assets liabilities					$ 30,000,000
Long-term debt				$ 47,585,000
Surety Bond
Loss Contingencies [Line Items]
Long-term debt				$ 116,000,000
Bernards Bros vs. Limbach Holdings | Subsequent Event | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 3,000,000
Lanzo Trenchless Technologies vs. Limbach Company LLC | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 400,000
Loss contingency, damages counterclaimed, value		$ 1,000,000