Self-Insurance - Additional Information (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Insurance [Abstract]
Payment to acquire workers' compensation and general liability insurance	$ 250
Malpractice insurance, annual coverage limit	$ 4,200

This element represent that amount of workers' compensation and general liability insurance purchased by company.

No definition available.

Name:	lmb_PaymentToAcquireWorkersCompensationAndGeneralLiabilityInsurance
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration