Segment Information - Percentage of Total Sales by Product Group (Details) - Sales	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	27.00%	23.00%	28.00%	23.00%
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	18.00%	22.00%	19.00%	22.00%
Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	13.00%	13.00%	14.00%
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	8.00%	4.00%	8.00%	4.00%
Fire & Rescue Helmets
Revenue from External Customer [Line Items]
Concentration risk percentage	5.00%	5.00%	5.00%	5.00%
Other
Revenue from External Customer [Line Items]
Concentration risk percentage	17.00%	21.00%	17.00%	20.00%