Subsequent Events (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Payments of the liability-classified contingent consideration arrangements	$ 1,700	$ 500
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event, Date	Jan. 08, 2016
Subsequent Event, Description	Pursuant to the terms of the Hyperspring Purchase Agreement, GSE Performance was required to pay the Sellers an additional $1.4 million based on EBITDA thresholds for the year ended November 13, 2015.
Payments of the liability-classified contingent consideration arrangements	$ 1,400
Subsequent Event 2 [Member]
Subsequent Event [Line Items]
Subsequent Event, Description	On March 17, 2016, GSE was awarded a contract to design, engineer and deliver three full scope simulator systems to an existing client, a major nuclear power plant operator based in the southern United States.