Revenue - Disaggregated Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 182,073	$ 179,354	$ 176,030	$ 168,016	$ 168,218	$ 178,462	$ 179,031	$ 161,662	$ 171,163	$ 174,556	$ 177,677	$ 153,735	$ 705,473	$ 687,373	$ 677,131
United States
Disaggregation of Revenue [Line Items]
Revenue													500,282	489,873	475,222
Other Americas
Disaggregation of Revenue [Line Items]
Revenue													86,939	89,254	83,643
Europe
Disaggregation of Revenue [Line Items]
Revenue													108,135	100,919	109,614
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													10,117	7,327	8,652
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													415,995	387,752	366,920
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													76,997	80,552	68,392
Industrials
Disaggregation of Revenue [Line Items]
Revenue													70,583	63,983	67,715
Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													33,974	42,104	52,746
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													47,603	54,827	51,399
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													29,108	27,223	32,290
Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													14,432	15,896	19,605
Other
Disaggregation of Revenue [Line Items]
Revenue													16,781	15,036	18,064
Operating segments \| North America
Disaggregation of Revenue [Line Items]
Revenue													579,330	573,336	555,387
Operating segments \| North America \| United States
Disaggregation of Revenue [Line Items]
Revenue													495,764	485,551	472,125
Operating segments \| North America \| Other Americas
Disaggregation of Revenue [Line Items]
Revenue													77,880	83,877	80,013
Operating segments \| North America \| Europe
Disaggregation of Revenue [Line Items]
Revenue													3,655	2,811	1,841
Operating segments \| North America \| Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													2,031	1,097	1,408
Operating segments \| North America \| Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													379,221	356,763	330,880
Operating segments \| North America \| Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													56,000	61,475	51,593
Operating segments \| North America \| Industrials
Disaggregation of Revenue [Line Items]
Revenue													42,518	38,197	41,873
Operating segments \| North America \| Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													23,598	31,197	39,966
Operating segments \| North America \| Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													33,035	40,778	38,742
Operating segments \| North America \| Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													16,620	15,283	16,809
Operating segments \| North America \| Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													13,216	15,360	19,378
Operating segments \| North America \| Other
Disaggregation of Revenue [Line Items]
Revenue													15,122	14,283	16,146
Operating segments \| International
Disaggregation of Revenue [Line Items]
Revenue													124,414	112,425	117,245
Operating segments \| International \| United States
Disaggregation of Revenue [Line Items]
Revenue													934	910	912
Operating segments \| International \| Other Americas
Disaggregation of Revenue [Line Items]
Revenue													12,906	9,076	5,003
Operating segments \| International \| Europe
Disaggregation of Revenue [Line Items]
Revenue													105,934	99,714	108,411
Operating segments \| International \| Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													4,640	2,725	2,919
Operating segments \| International \| Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													36,615	30,654	35,232
Operating segments \| International \| Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													20,711	18,763	16,513
Operating segments \| International \| Industrials
Disaggregation of Revenue [Line Items]
Revenue													26,292	23,703	24,000
Operating segments \| International \| Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													6,609	8,304	9,927
Operating segments \| International \| Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													14,456	14,021	12,593
Operating segments \| International \| Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													9,320	7,946	11,496
Operating segments \| International \| Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													1,216	536	227
Operating segments \| International \| Other
Disaggregation of Revenue [Line Items]
Revenue													9,195	8,498	7,257
Operating segments \| Products
Disaggregation of Revenue [Line Items]
Revenue													12,986	12,727	13,831
Operating segments \| Products \| United States
Disaggregation of Revenue [Line Items]
Revenue													5,956	6,495	6,469
Operating segments \| Products \| Other Americas
Disaggregation of Revenue [Line Items]
Revenue													850	406	395
Operating segments \| Products \| Europe
Disaggregation of Revenue [Line Items]
Revenue													1,927	1,896	2,174
Operating segments \| Products \| Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													4,253	3,930	4,793
Operating segments \| Products \| Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													159	335	808
Operating segments \| Products \| Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													286	314	286
Operating segments \| Products \| Industrials
Disaggregation of Revenue [Line Items]
Revenue													1,773	2,083	1,842
Operating segments \| Products \| Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													3,767	2,603	2,853
Operating segments \| Products \| Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													112	28	64
Operating segments \| Products \| Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													3,168	3,994	3,985
Operating segments \| Products \| Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Operating segments \| Products \| Other
Disaggregation of Revenue [Line Items]
Revenue													3,721	3,370	3,993
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue													(11,257)	(11,115)	(9,332)
Corp/Elim \| United States
Disaggregation of Revenue [Line Items]
Revenue													(2,372)	(3,083)	(4,284)
Corp/Elim \| Other Americas
Disaggregation of Revenue [Line Items]
Revenue													(4,697)	(4,105)	(1,768)
Corp/Elim \| Europe
Disaggregation of Revenue [Line Items]
Revenue													(3,381)	(3,502)	(2,812)
Corp/Elim \| Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue													(807)	(425)	(468)
Corp/Elim \| Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Industrials
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Power Generation and Transmission
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Petrochemical
Disaggregation of Revenue [Line Items]
Revenue													0	0	0
Corp/Elim \| Other
Disaggregation of Revenue [Line Items]
Revenue													$ (11,257)	$ (11,115)	$ (9,332)