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Contracts in Progress (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Revenue earned on uncompleted contracts | $ 622,413 | $ 557,164
Less: Billings to date | (633,640) | (552,701)
Net underbilling (overbilling) | (11,227) | 4,463
Costs and estimated earnings in excess of billing on uncompleted contracts | 32,723 | 33,006
Billings in excess of costs and estimated earnings on uncompleted contracts | (43,950) | (28,543)
Net underbilling (overbilling) | $ (11,227) | $ 4,463

X
- Definition Amount of liability attributable to billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts and billings in excess of estimated earnings on uncompleted contracts. + References No definition available. + Details
Name: | lmb_BillingsInExcessOfCostsAndEstimatedEarningsOnUncompletedContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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: | duration

X
- Definition Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings. + References No definition available. + Details
Name: | lmb_CostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of liability for net overbillings on the contracts. + References No definition available. + Details
Name: | lmb_NetOvebillingOnContracts
Namespace Prefix: | lmb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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: | duration