Employee Benefit Plans - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) CompensationPlan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans | CompensationPlan	3
Accumulated benefit obligations	$ 1.1	$ 0.9
Number of company sponsored 401(K) defined contribution plans | CompensationPlan	1
Provision for matching and profit sharing contribution	$ 2.7	3.2	$ 3.3
Estimated net actuarial loss for the defined benefit pension plan	0.8
Excess of accumulated benefit obligation over fair value of plan assets	11.1
Pension liability	5.8	5.6
Estimated employer Contribution to pension plan in next fiscal year	$ 0.9
Plan One covering all employees, other than employees of Miltec
Defined Benefit Plan Disclosure [Line Items]
Contribution by employee towards defined benefit plan	25.00%
Contribution by employer towards defined benefit plan	50.00%
Employee contribution compensation limit	6.00%
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Liability for LaBarge Deferred Compensation Plan	$ 0.6	0.5
Interest on LaBarge Deferred Compensation Plan	$ 0.8	$ 1.7
Executives and Directors
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans | CompensationPlan	2