Accrued Warranty Costs - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012
Accrued Warranty Costs [Line Items]
Commercial and industrial products base warranty coverage for manufactured equipment	Eighteen months from the date of shipment or twelve months from the date of startup, whichever is shorter
Commercial and industrial product base warranty coverage for spare parts	90 days
Residential products, the base warranty coverage from the date of shipment for material	10 years
Residential products warranty coverage for labor associated with repair	5 years