Business Segment Information - Intra-Segment and Inter-Segment Revenues (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
Segment Reporting Information [Line Items]
Total sales	$ 47,568	$ 35,828	$ 83,353	$ 71,270
Net sales to outside customers	44,433	34,592	78,794	67,618
Engineered Equipment Technology and Parts [Member]
Segment Reporting Information [Line Items]
Total sales	36,239	23,135	61,457	45,560
Engineered Equipment Technology and Parts [Member] | United States [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total sales	24,561	19,506	43,954	38,427
Engineered Equipment Technology and Parts [Member] | Netherlands [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total sales	8,280		10,394
Engineered Equipment Technology and Parts [Member] | China [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total sales	2,022	1,614	3,976	3,057
Engineered Equipment Technology and Parts [Member] | Canada [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total sales	1,376	2,015	3,133	3,955
Engineered Equipment Technology and Parts [Member] | Brazil [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Total sales				121
Contracting / Services [Member]
Segment Reporting Information [Line Items]
Total sales	5,230	6,866	10,365	14,411
Component Parts [Member]
Segment Reporting Information [Line Items]
Total sales	6,099	5,832	11,531	11,280
Corporate and other [Member]
Segment Reporting Information [Line Items]
Total sales		(5)		19
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	44,433	34,592	78,794	67,618
Operating Segments [Member] | Intra-segment [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(2,477)	(948)	(2,888)	(2,030)
Operating Segments [Member] | Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment	(93)	(119)	(1,076)	(553)
Inter-segment Sales Purchases by Contracting or Services Segment	(688)	(261)	(891)	(1,119)
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other	123	92	296	50
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	33,560	22,225	58,570	43,115
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | United States [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	23,508	19,355	42,703	37,464
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Netherlands [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	8,280	0	10,394	0
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | China [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	1,057	782	3,011	1,502
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Canada [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	715	2,088	2,462	4,028
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Brazil [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	0	0	0	121
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Intra-segment [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(2,203)	(865)	(2,411)	(1,835)
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Intra-segment [Member] | United States [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(577)	(106)	(775)	(353)
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Intra-segment [Member] | Netherlands [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Intra-segment [Member] | China [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(965)	(832)	(965)	(1,555)
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Intra-segment [Member] | Canada [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(661)	73	(671)	73
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Intra-segment [Member] | Brazil [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment	(476)	(45)	(476)	(610)
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Inter-segment Elimination [Member] | United States [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment	(476)	(45)	(476)	(610)
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Inter-segment Elimination [Member] | Netherlands [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Inter-segment Elimination [Member] | China [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Inter-segment Elimination [Member] | Canada [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] | Inter-segment Elimination [Member] | Brazil [Member] | Reportable Subsegments [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Contracting / Services [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	4,976	6,746	9,095	13,828
Operating Segments [Member] | Contracting / Services [Member] | Intra-segment [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(163)	(14)	(207)	(48)
Operating Segments [Member] | Contracting / Services [Member] | Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment	(91)	(106)	(1,063)	(535)
Inter-segment Sales Purchases by Contracting or Services Segment
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Component Parts [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	5,774	5,534	10,833	10,616
Operating Segments [Member] | Component Parts [Member] | Intra-segment [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales	(111)	(69)	(270)	(147)
Operating Segments [Member] | Component Parts [Member] | Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment	(2)	(13)	(13)	(18)
Inter-segment Sales Purchases by Contracting or Services Segment	(212)	(216)	(415)	(499)
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other
Operating Segments [Member] | Corporate and other [Member]
Segment Reporting Information [Line Items]
Net sales to outside customers	123	87	296	59
Operating Segments [Member] | Corporate and other [Member] | Intra-segment [Member]
Segment Reporting Information [Line Items]
Less intra-segment sales
Operating Segments [Member] | Corporate and other [Member] | Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Inter-segment Sales Purchases by Engineered Equipment Technology and Parts Segment
Inter-segment Sales Purchases by Contracting or Services Segment				(10)
Inter-segment Sales Purchases by Component Parts Segment
Inter-segment Sales Purchases by Corporate and other	$ 123	$ 92	$ 296	$ 50