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Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 179,354	$ 178,462	$ 523,399	$ 519,155
United States
Disaggregation of Revenue [Line Items]
Revenue	126,542	130,871	373,280	373,220
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	24,000	22,593	65,339	64,385
Europe
Disaggregation of Revenue [Line Items]
Revenue	27,038	23,019	77,162	76,666
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,774	1,979	7,618	4,884
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	103,252	97,031	308,041	292,519
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	20,065	21,293	57,685	63,807
Industrials
Disaggregation of Revenue [Line Items]
Revenue	16,653	15,998	50,303	47,668
Power Generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	9,737	12,780	25,863	31,062
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	9,792	13,324	35,546	42,545
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	9,495	7,870	22,002	19,130
Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	3,899	3,707	10,914	10,469
Other
Disaggregation of Revenue [Line Items]
Revenue	6,461	6,459	13,045	11,955
Operating segments | North America
Disaggregation of Revenue [Line Items]
Revenue	148,814	152,778	431,295	435,251
Operating segments | North America | United States
Disaggregation of Revenue [Line Items]
Revenue	126,239	130,206	369,811	370,426
Operating segments | North America | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	21,907	21,649	57,218	62,254
Operating segments | North America | Europe
Disaggregation of Revenue [Line Items]
Revenue	465	631	3,159	1,790
Operating segments | North America | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	203	292	1,107	781
Operating segments | North America | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	94,390	90,578	281,663	270,289
Operating segments | North America | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	14,240	16,784	41,516	49,106
Operating segments | North America | Industrials
Disaggregation of Revenue [Line Items]
Revenue	10,325	9,728	30,693	28,529
Operating segments | North America | Power Generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	7,388	10,378	17,834	22,578
Operating segments | North America | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	6,933	10,283	24,906	32,217
Operating segments | North America | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	6,042	4,936	12,696	10,625
Operating segments | North America | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	3,313	3,427	10,027	10,056
Operating segments | North America | Other
Disaggregation of Revenue [Line Items]
Revenue	6,183	6,664	11,960	11,851
Operating segments | International
Disaggregation of Revenue [Line Items]
Revenue	30,980	25,693	90,664	83,441
Operating segments | International | United States
Disaggregation of Revenue [Line Items]
Revenue	120	240	709	747
Operating segments | International | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	3,703	2,064	11,013	4,781
Operating segments | International | Europe
Disaggregation of Revenue [Line Items]
Revenue	26,764	22,648	75,421	75,921
Operating segments | International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	393	741	3,521	1,992
Operating segments | International | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	8,827	6,418	26,291	22,018
Operating segments | International | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	5,778	4,397	15,894	14,455
Operating segments | International | Industrials
Disaggregation of Revenue [Line Items]
Revenue	6,018	5,834	18,274	17,868
Operating segments | International | Power Generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,653	1,946	4,840	6,505
Operating segments | International | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	2,864	3,033	10,567	10,305
Operating segments | International | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	2,383	1,784	6,547	6,016
Operating segments | International | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	586	280	887	413
Operating segments | International | Other
Disaggregation of Revenue [Line Items]
Revenue	2,871	2,001	7,364	5,861
Operating segments | Products
Disaggregation of Revenue [Line Items]
Revenue	2,829	3,078	9,897	8,666
Operating segments | Products | United States
Disaggregation of Revenue [Line Items]
Revenue	1,032	1,523	4,478	4,366
Operating segments | Products | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	49	154	673	338
Operating segments | Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	510	362	1,275	1,456
Operating segments | Products | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,238	1,039	3,471	2,506
Operating segments | Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	35	35	87	212
Operating segments | Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	47	112	275	246
Operating segments | Products | Industrials
Disaggregation of Revenue [Line Items]
Revenue	310	436	1,336	1,271
Operating segments | Products | Power Generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	696	456	3,189	1,979
Operating segments | Products | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	(5)	8	73	23
Operating segments | Products | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	1,070	1,150	2,759	2,489
Operating segments | Products | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Operating segments | Products | Other
Disaggregation of Revenue [Line Items]
Revenue	676	881	2,178	2,446
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue	(3,269)	(3,087)	(8,457)	(8,203)
Corp/Elim | United States
Disaggregation of Revenue [Line Items]
Revenue	(849)	(1,098)	(1,718)	(2,319)
Corp/Elim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	(1,659)	(1,274)	(3,565)	(2,988)
Corp/Elim | Europe
Disaggregation of Revenue [Line Items]
Revenue	(701)	(622)	(2,693)	(2,501)
Corp/Elim | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	(60)	(93)	(481)	(395)
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	$ (3,269)	$ (3,087)	$ (8,457)	$ (8,203)

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