Revenue from Contracts with Customers - Schedule of Contracts In Progress (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue earned on uncompleted contracts	$ 613,235	$ 618,153
Less: Billings to date	(619,863)	(635,266)
Net (overbilling) underbilling	(6,628)	(17,113)
Costs and estimated earnings in excess of billings on uncompleted contracts	30,608	27,304
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (37,236)	$ (44,417)

Billings In Excess Of Billings And Estimated Earnings On Uncompleted Contracts

No definition available.

Name:	lmb_BillingsInExcessOfBillingsAndEstimatedEarningsOnUncompletedContracts
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of billings that were raised on the contracts to date during the period.

No definition available.

Name:	lmb_BillingsToDateOnContracts
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Costs In Excess Of Billings And Estimated Earnings On Uncompleted Contracts

No definition available.

Name:	lmb_CostsInExcessOfBillingsAndEstimatedEarningsOnUncompletedContracts
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount of Asset or liability for net Under Over billings on the contracts.

No definition available.

Name:	lmb_NetUnderOverbillingOnContracts
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of revenue earned from uncompleted contracts during the period.

No definition available.

Name:	lmb_RevenueEarnedOnUncompletedContracts
Namespace Prefix:	lmb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration