Segment Information - Narrative (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of reportable segments	5
Product Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Kitchen Range Hoods [Member] | RESV [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	11.60%	11.90%	14.10%
Product Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Exhaust Fans [Member] | RESV [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	9.20%	10.30%
Product Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Commercial Air Handlers [Member] | CES [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	14.60%	11.40%	10.90%
Product Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Digital Display Mounting and Mobility Products [Member] | DMS [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.90%	12.70%
Foreign Countries [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	18.80%	19.70%	17.90%
Foreign Countries [Member] | Geographic Concentration Risk [Member] | Assets, Total [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.40%	10.50%
Foreign Countries [Member] | Geographic Concentration Risk [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	25.00%	23.80%