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Business Segment Information - Net Operating Income (Loss) by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Income from Operations (loss) by business segment |  |  |  |
Net operating income | $ 3,307 | $ 4,285 | $ 6,645 | $ 8,032
Engineered Equipment Technology and Parts [Member] |  |  |  |
Income from Operations (loss) by business segment |  |  |  |
Net operating income | 5,753 | 3,859 | 10,033 | 7,164
Contracting / Services [Member] |  |  |  |
Income from Operations (loss) by business segment |  |  |  |
Net operating income | 346 | 563 | 919 | 1,684
Component Parts [Member] |  |  |  |
Income from Operations (loss) by business segment |  |  |  |
Net operating income | 1,137 | 1,323 | 2,057 | 2,412
Corporate and other [Member] |  |  |  |
Income from Operations (loss) by business segment |  |  |  |
Net operating income | (3,686) | (1,517) | (6,151) | (3,212)
Inter-segment Elimination [Member] |  |  |  |
Income from Operations (loss) by business segment |  |  |  |
Net operating income | $ (243) | $ 57 | $ (213) | $ (16)

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