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Revenue - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 178,462	$ 174,556	$ 519,155	$ 505,968
United States
Disaggregation of Revenue [Line Items]
Revenue	130,871	122,948	373,220	352,547
Other Americas
Disaggregation of Revenue [Line Items]
Revenue	22,593	22,650	64,385	64,438
Europe
Disaggregation of Revenue [Line Items]
Revenue	23,019	26,620	76,666	83,094
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,979	2,338	4,884	5,889
Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	97,031	92,452	292,519	275,239
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	21,293	16,715	63,807	49,825
Industrials
Disaggregation of Revenue [Line Items]
Revenue	15,998	17,589	47,668	49,438
Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	12,780	14,687	31,062	37,044
Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	13,324	11,886	42,545	36,681
Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	7,870	10,411	19,130	27,733
Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	3,707	5,046	10,469	16,566
Other
Disaggregation of Revenue [Line Items]
Revenue	6,459	5,770	11,955	13,442
Operating segments | Services
Disaggregation of Revenue [Line Items]
Revenue	152,778	144,976	435,251	414,251
Operating segments | Services | United States
Disaggregation of Revenue [Line Items]
Revenue	130,206	122,506	370,426	349,814
Operating segments | Services | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	21,649	21,681	62,254	61,847
Operating segments | Services | Europe
Disaggregation of Revenue [Line Items]
Revenue	631	491	1,790	1,381
Operating segments | Services | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	292	298	781	1,209
Operating segments | Services | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	90,578	83,534	270,289	248,584
Operating segments | Services | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	16,784	12,717	49,106	37,319
Operating segments | Services | Industrials
Disaggregation of Revenue [Line Items]
Revenue	9,728	10,560	28,529	30,621
Operating segments | Services | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	10,378	11,412	22,578	27,019
Operating segments | Services | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	10,283	8,819	32,217	27,031
Operating segments | Services | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	4,936	7,136	10,625	15,479
Operating segments | Services | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	3,427	4,974	10,056	16,375
Operating segments | Services | Other
Disaggregation of Revenue [Line Items]
Revenue	6,664	5,824	11,851	11,823
Operating segments | International
Disaggregation of Revenue [Line Items]
Revenue	25,693	29,100	83,441	88,699
Operating segments | International | United States
Disaggregation of Revenue [Line Items]
Revenue	240	221	747	670
Operating segments | International | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	2,064	1,446	4,781	3,772
Operating segments | International | Europe
Disaggregation of Revenue [Line Items]
Revenue	22,648	26,378	75,921	82,356
Operating segments | International | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	741	1,055	1,992	1,901
Operating segments | International | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	6,418	8,548	22,018	26,017
Operating segments | International | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	4,397	3,897	14,455	12,341
Operating segments | International | Industrials
Disaggregation of Revenue [Line Items]
Revenue	5,834	6,693	17,868	17,736
Operating segments | International | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	1,946	2,615	6,505	7,776
Operating segments | International | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	3,033	3,035	10,305	9,574
Operating segments | International | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	1,784	2,467	6,016	9,477
Operating segments | International | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	280	72	413	191
Operating segments | International | Other
Disaggregation of Revenue [Line Items]
Revenue	2,001	1,773	5,861	5,587
Operating segments | Products
Disaggregation of Revenue [Line Items]
Revenue	3,078	3,308	8,666	9,499
Operating segments | Products | United States
Disaggregation of Revenue [Line Items]
Revenue	1,523	1,562	4,366	4,690
Operating segments | Products | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	154	133	338	301
Operating segments | Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	362	499	1,456	1,462
Operating segments | Products | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	1,039	1,114	2,506	3,046
Operating segments | Products | Oil & Gas
Disaggregation of Revenue [Line Items]
Revenue	35	370	212	638
Operating segments | Products | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	112	101	246	165
Operating segments | Products | Industrials
Disaggregation of Revenue [Line Items]
Revenue	436	336	1,271	1,081
Operating segments | Products | Power generation & Transmission
Disaggregation of Revenue [Line Items]
Revenue	456	660	1,979	2,249
Operating segments | Products | Other Process Industries
Disaggregation of Revenue [Line Items]
Revenue	8	32	23	76
Operating segments | Products | Infrastructure, Research & Engineering
Disaggregation of Revenue [Line Items]
Revenue	1,150	808	2,489	2,777
Operating segments | Products | Petrochemical
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Operating segments | Products | Other
Disaggregation of Revenue [Line Items]
Revenue	881	1,001	2,446	2,513
Corp/Elim
Disaggregation of Revenue [Line Items]
Revenue	(3,087)	(2,828)	(8,203)	(6,481)
Corp/Elim | United States
Disaggregation of Revenue [Line Items]
Revenue	(1,098)	(1,341)	(2,319)	(2,627)
Corp/Elim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	(1,274)	(610)	(2,988)	(1,482)
Corp/Elim | Europe
Disaggregation of Revenue [Line Items]
Revenue	(622)	(748)	(2,501)	(2,105)
Corp/Elim | Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	(93)	(129)	(395)	(267)
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	$ (3,087)	$ (2,828)	$ (8,203)	$ (6,481)

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