Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014
Goodwill [Line Items]
Goodwill impairment	$ 6.4us-gaap_GoodwillImpairmentLoss
Goodwill loss of discontinued operations	14.3
Consolidated gross goodwill			396.2us-gaap_GoodwillGross
EWI
Goodwill [Line Items]
Goodwill impairment	6.4
Component Products Segment
Goodwill [Line Items]
Goodwill impairment		10.1
Discontinued operations \| CompX
Goodwill [Line Items]
Goodwill loss of discontinued operations	$ 14.3