Investment In Affiliates - Additional Information (Detail) (USD $)	Dec. 31, 2012
Safety Hi-Tech S.r.l
Investment [Line Items]
Percentage of ownership in Joint Venture	40.00%
Equity method investments	$ 516,000
Safety Hi-Tech S.r.l \| Equipment
Investment [Line Items]
Equity method investments	408,000
Banini-Binotti Associates
Investment [Line Items]
Percentage of ownership in Joint Venture	20.00%
Safety Hi-Tech Usa Llc
Investment [Line Items]
Percentage of ownership in Joint Venture	50.00%
Equity method investments	$ 622,000

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant