The amount of the cost recognized for matching contribution during the period for defined contribution plans.

No definition available.

Name:	lmia_DefinedContributionPlanCostRecognizedForMatchingContribution
Namespace Prefix:	lmia_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis=lmia_LmiPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis=lmia_ValentPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lmia_EngineeringServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=lmia_AerostructuresMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEFINED CONTRIBUTIONS PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	25.00%
LMI Profit Sharing and Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contribution per employee amount			$ 1
Recognized cost for matching contributions	$ 1,451	$ 1,519	$ 729
Employer matching contribution percentage (in hundredths)			50.00%
Valent Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Recognized cost for matching contributions			$ 848
Employer matching contribution percentage (in hundredths)			3.00%
Employer matching contribution threshold			3.00%
Engineering Services [Member] \| LMI Profit Sharing and Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution threshold	3.00%
Aerostructures [Member] \| LMI Profit Sharing and Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution threshold	5.00%