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Business Segment Information - Net Operating Income (Loss) by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income from Operations (loss) by business segment
Net operating income	$ (3,356)	$ 4,251	$ 3,289	$ 12,283
Inter-segment Elimination [Member]
Income from Operations (loss) by business segment
Net operating income	(633)	(42)	(846)	(58)
Engineered Equipment Technology and Parts [Member] | Operating Segments [Member]
Income from Operations (loss) by business segment
Net operating income	4,176	3,946	14,209	11,110
Met-Pro [Member] | Operating Segments [Member]
Income from Operations (loss) by business segment
Net operating income	(406)		(406)
Contracting / Services [Member] | Operating Segments [Member]
Income from Operations (loss) by business segment
Net operating income	(2,187)	836	(1,268)	2,520
Component Parts [Member] | Operating Segments [Member]
Income from Operations (loss) by business segment
Net operating income	1,028	966	3,085	3,378
Corporate and other [Member] | Operating Segments [Member]
Income from Operations (loss) by business segment
Net operating income	$ (5,334)	$ (1,455)	$ (11,485)	$ (4,667)

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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