Goodwill - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012 EWI	Dec. 31, 2010 Component Products Segment	Dec. 31, 2012 Compx Furniture Components
Goodwill [Line Items]
Goodwill impairment	$ 6.4		$ 6.4	$ 10.1
Goodwill loss of discontinued operations	14.3				14.3
Consolidated gross goodwill		$ 396.2