Business Segment Information - Net Sales by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Sales by Business Segment
Net sales	$ 44,433	$ 34,592	$ 78,794	$ 67,618
Operating Segments [Member]
Net Sales by Business Segment
Net sales	44,433	34,592	78,794	67,618
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member]
Net Sales by Business Segment
Net sales	33,560	22,225	58,570	43,115
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member] | Reportable Subsegments [Member]
Net Sales by Business Segment
Net sales	23,508	19,355	42,703	37,464
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member] | Reportable Subsegments [Member]
Net Sales by Business Segment
Net sales	8,280	0	10,394	0
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member] | Reportable Subsegments [Member]
Net Sales by Business Segment
Net sales	715	2,088	2,462	4,028
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | China [Member] | Reportable Subsegments [Member]
Net Sales by Business Segment
Net sales	1,057	782	3,011	1,502
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Brazil [Member] | Reportable Subsegments [Member]
Net Sales by Business Segment
Net sales	0	0	0	121
Operating Segments [Member] | Contracting / Services [Member]
Net Sales by Business Segment
Net sales	4,976	6,746	9,095	13,828
Operating Segments [Member] | Component Parts [Member]
Net Sales by Business Segment
Net sales	5,774	5,534	10,833	10,616
Operating Segments [Member] | Corporate [Member]
Net Sales by Business Segment
Net sales	$ 123	$ 87	$ 296	$ 59