Goodwill and Intangible Assets - Changes in Goodwill Balances by Segment (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Goodwill [Line Items]
Goodwill, beginning balance	$ 22,735,000
Translation Adjustment	(12,000)
Goodwill, ending balance	22,723,000
SLPE [Member]
Goodwill [Line Items]
Goodwill, beginning balance	4,242,000
Translation Adjustment	(12,000)
Goodwill, ending balance	4,230,000
MTE Corporation [Member]
Goodwill [Line Items]
Goodwill, beginning balance	8,189,000
Translation Adjustment
Goodwill, ending balance	8,189,000
Teal Electronics Corp [Member]
Goodwill [Line Items]
Goodwill, beginning balance	5,055,000
Translation Adjustment
Goodwill, ending balance	5,055,000
RFL [Member]
Goodwill [Line Items]
Goodwill, beginning balance	5,249,000
Translation Adjustment
Goodwill, ending balance	$ 5,249,000