Revenue from Contracts with Customers - Contracts In Progress (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue earned on uncompleted contracts	$ 679,170	$ 758,450
Less: Billings to date	(671,274)	(737,296)
Net underbilling	7,896	21,154
Costs in excess of billings and estimated earnings	41,949	47,447
Billings in excess of costs and estimated earnings	$ (34,053)	$ (26,293)

Billings In Excess Of Billings And Estimated Earnings On Uncompleted Contracts

No definition available.

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

No definition available.

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Costs In Excess Of Billings And Estimated Earnings On Uncompleted Contracts

No definition available.

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

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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

No definition available.

Name:	lmb_RevenueEarnedOnUncompletedContracts
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

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