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Contract Assets and Liabilities - Contracts in Progress (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Revenue from Contract with Customer [Abstract] |  |
Revenue earned on uncompleted contracts | $ 752,564 | $ 726,215
Less: Billings to date | (766,690) | (722,562)
Net underbilling (overbilling) | (14,126) | 3,653
Costs in excess of billings and estimated earnings | 31,894 | 44,315
Billings in excess of costs and estimated earnings | $ (46,020) | $ (40,662)

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- Definition The amount of billings that were raised on the contracts to date during the period. + References No definition available. + Details
Name: | lmb_BillingsToDateOnContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Billings in Excess of Billings and Estimated Earnings on Uncompleted Contracts + References No definition available. + Details
Name: | lmb_BillingsinExcessofBillingsandEstimatedEarningsonUncompletedContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Costs in Excess of Billings and Estimated Earnings on Uncompleted Contracts + References No definition available. + Details
Name: | lmb_CostsinExcessofBillingsandEstimatedEarningsonUncompletedContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of Asset or liability for net Under Over billings on the contracts. + References No definition available. + Details
Name: | lmb_NetUnderOverbillingOnContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of revenue earned from uncompleted contracts during the period. + References No definition available. + Details
Name: | lmb_RevenueEarnedOnUncompletedContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration