Interim Financial Data (Unaudited) - Summary of Interim Financial Data (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Interim Reporting [Line Items]
Increase in warranty reserve	$ 20,000
Provision (benefit) for income taxes		25,427	(10,549)	1,009
Surface Flaking Warranty Reserve [Member]
Interim Reporting [Line Items]
Increase in warranty reserve	20,000		20,000
Exit Full Valuation Allowance [Member]
Interim Reporting [Line Items]
Provision (benefit) for income taxes					$ 10,900