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Revenue - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 176,030	$ 179,031	$ 344,046	$ 340,693
United States
Disaggregation of Revenue [Line Items]
Revenue	124,626	127,545	246,738	242,349
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	23,686	22,992	41,339	41,792
Europe
Disaggregation of Revenue [Line Items]
Revenue	25,094	27,327	50,124	53,647
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	2,624	1,167	5,845	2,905
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	106,124	101,265	204,789	195,488
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	19,018	22,444	37,620	42,514
Industrials
Disaggregation of Revenue [Line Items]
Revenue	17,737	16,633	33,650	31,670
Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	8,156	11,053	16,126	18,282
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	13,381	15,409	25,754	29,221
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	6,746	5,818	12,507	11,260
Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	1,733	3,639	7,015	6,762
Other
Disaggregation of Revenue [Line Items]
Revenue	3,135	2,770	6,585	5,496
Operating segments | North America
Disaggregation of Revenue [Line Items]
Revenue	145,550	149,528	282,482	282,474
Operating segments | North America | United States
Disaggregation of Revenue [Line Items]
Revenue	122,972	126,286	243,572	240,221
Operating segments | North America | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	21,041	22,553	35,311	40,605
Operating segments | North America | Europe
Disaggregation of Revenue [Line Items]
Revenue	1,282	415	2,694	1,159
Operating segments | North America | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	255	274	905	489
Operating segments | North America | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	97,500	93,098	187,273	179,711
Operating segments | North America | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	13,665	17,300	27,276	32,322
Operating segments | North America | Industrials
Disaggregation of Revenue [Line Items]
Revenue	11,066	9,794	20,368	18,801
Operating segments | North America | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	5,459	8,378	10,446	12,200
Operating segments | North America | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	8,864	11,641	17,973	21,934
Operating segments | North America | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	4,171	3,183	6,654	5,689
Operating segments | North America | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	1,577	3,584	6,714	6,629
Operating segments | North America | Other
Disaggregation of Revenue [Line Items]
Revenue	3,248	2,550	5,778	5,188
Operating segments | International
Disaggregation of Revenue [Line Items]
Revenue	30,277	29,610	59,684	57,748
Operating segments | International | United States
Disaggregation of Revenue [Line Items]
Revenue	280	334	589	507
Operating segments | International | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	3,821	1,376	7,310	2,717
Operating segments | International | Europe
Disaggregation of Revenue [Line Items]
Revenue	24,474	27,353	48,657	53,273
Operating segments | International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,702	547	3,128	1,251
Operating segments | International | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	8,609	8,028	17,464	15,600
Operating segments | International | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	5,136	5,118	10,116	10,058
Operating segments | International | Industrials
Disaggregation of Revenue [Line Items]
Revenue	6,203	6,506	12,256	12,034
Operating segments | International | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,530	1,997	3,187	4,559
Operating segments | International | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	4,466	3,754	7,703	7,272
Operating segments | International | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	2,028	2,193	4,164	4,232
Operating segments | International | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	156	55	301	133
Operating segments | International | Other
Disaggregation of Revenue [Line Items]
Revenue	2,149	1,959	4,493	3,860
Operating segments | Products
Disaggregation of Revenue [Line Items]
Revenue	3,329	2,652	7,068	5,588
Operating segments | Products | United States
Disaggregation of Revenue [Line Items]
Revenue	1,645	1,492	3,446	2,843
Operating segments | Products | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	298	168	624	184
Operating segments | Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	504	514	765	1,094
Operating segments | Products | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	882	478	2,233	1,467
Operating segments | Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	15	139	52	177
Operating segments | Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	217	26	228	134
Operating segments | Products | Industrials
Disaggregation of Revenue [Line Items]
Revenue	468	333	1,026	835
Operating segments | Products | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,167	678	2,493	1,523
Operating segments | Products | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	51	14	78	15
Operating segments | Products | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	547	442	1,689	1,339
Operating segments | Products | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Operating segments | Products | Other
Disaggregation of Revenue [Line Items]
Revenue	864	1,020	1,502	1,565
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue	(3,126)	(2,759)	(5,188)	(5,117)
Corp/Elim | United States
Disaggregation of Revenue [Line Items]
Revenue	(271)	(567)	(869)	(1,222)
Corp/Elim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	(1,474)	(1,105)	(1,906)	(1,714)
Corp/Elim | Europe
Disaggregation of Revenue [Line Items]
Revenue	(1,166)	(955)	(1,992)	(1,879)
Corp/Elim | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	(215)	(132)	(421)	(302)
Corp/Elim | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Industrials
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corp/Elim | Other
Disaggregation of Revenue [Line Items]
Revenue	$ (3,126)	$ (2,759)	$ (5,188)	$ (5,117)

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