Other Assets - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Long Lived Assets Held For Sale [Line Items]
Assets held for sale write-down			$ 1,162,000	$ 1,135,000
Proceeds from sale of assets-held-for-sale		5,000	3,290,000	184,000
Loss on sale of facility			3,200,000
CompX
Long Lived Assets Held For Sale [Line Items]
Assets held for sale write-down	400,000			1,100,000
Proceeds from sale of assets-held-for-sale		1,600,000	3,600,000
Loss on sale of facility			$ 800,000