Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Income taxes related to discontinued operations		$ (570,000)	$ (5,051,000)	$ (3,351,000)
Company's gross foreign tax credits			17,000
Undistributed earnings of foreign subsidiaries		10,548,000
Company's Research and Development Tax credits		1,047,000	876,000
Gross operating loss carry forwards Federal		3,786,000
Gross operating loss carry forwards State		1,960,000
Gross foreign net operating loss that does not expire		576,000
Net deferred tax taxes more likely than not to be realized		13,134,000
Allowances against Gross Deferred Tax Assets		1,987,000
Examination by IRS		During the third quarter of 2011 the Company was contacted by the Internal Revenue Service (the "IRS") to examine the calendar years 2009 and 2010. The examination was completed during the fourth quarter of 2012 with no material adjustments.
Recognized income from previously unrecognized tax position related to the settlement	787,000
Recognized income tax	619,000
Recognized income interest	168,000
Liability for interest and penalties related to unrecognized tax benefits		62,000	80,000
Gross unrecognized tax benefits balance, Minimum			0
Gross unrecognized tax benefits balance, Maximum			37,000
Other Long Term Liabilities, Unrecognized tax benefits, interest and penalties		657,000	802,000
Elektro-Metall Export GmbH [Member] | Foreign Tax Authority [Member]
Income Taxes [Line Items]
Recognized income from previously unrecognized tax position related to the settlement	787,000		787,000
Recognized income tax	619,000		619,000
Recognized income interest	168,000		168,000
Minimum [Member]
Income Taxes [Line Items]
Operating loss carry forwards expiration date		2013
Maximum [Member]
Income Taxes [Line Items]
Operating loss carry forwards expiration date		2032
Foreign Tax Credit Carry Forward [Member]
Income Taxes [Line Items]
Company's gross foreign tax credits		0	17,000
Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Company's Research and Development Tax credits		1,047,000	876,000
Gross research and development tax credit indefinite carry forward		679,000
Federal research and development credits [Member]
Income Taxes [Line Items]
Company's Research and Development Tax credits		0
Research Definite Carry Forward [Member]
Income Taxes [Line Items]
Company's Research and Development Tax credits		$ 368,000
Period of company's gross research and development tax credit carry forward		15 years
Expiration of company's gross research and development tax credit carry forward, Minimum		2015
Expiration of company's gross research and development tax credit carry forward, Maximum		2027