Segment Information - Percentage of Total Sales by Product Group (Details) - Sales	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	24.00%	30.00%	26.00%	25.00%
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	20.00%	20.00%	22.00%
Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	12.00%	13.00%	13.00%
Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	12.00%	10.00%	12.00%
Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	4.00%	9.00%	4.00%
Fire & Rescue Helmets
Revenue from External Customer [Line Items]
Concentration risk percentage	4.00%	5.00%	5.00%	5.00%
Other
Revenue from External Customer [Line Items]
Concentration risk percentage	17.00%	17.00%	17.00%	19.00%