Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax [Line Items]
Estimated effective income tax rate	37.20%	39.10%	17.40%
Valuation allowance	$ 22,720	$ 23,517
Income tax examination, year under examination	2013
Liabilities for uncertain tax positions	$ 100	$ 100
ILLINOIS
Income Tax [Line Items]
Valuation allowance	1,200
Released valuation allowance related to Illinois EDGE R&D credits	700
Italy | Foreign Tax Authority
Income Tax [Line Items]
Valuation allowance	$ 21,500