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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Revenue
Revenue	$ 119,077	$ 102,645	$ 221,680	$ 194,483
Domestic
Revenue
Revenue	119,077	102,645	221,680	194,483
Energy
Revenue
Revenue	98,015	84,675	181,300	159,561
Energy | Domestic
Revenue
Revenue	98,015	84,675	181,300	159,561
Engineering and Consulting
Revenue
Revenue	21,062	17,970	40,380	34,922
Engineering and Consulting | Domestic
Revenue
Revenue	21,062	17,970	40,380	34,922
Commercial
Revenue
Revenue	8,816	8,177	16,699	17,744
Commercial | Energy
Revenue
Revenue	7,440	6,701	14,159	14,790
Commercial | Engineering and Consulting
Revenue
Revenue	1,376	1,476	2,540	2,954
Government
Revenue
Revenue	60,153	46,199	104,323	80,011
Government | Energy
Revenue
Revenue	40,543	29,861	66,618	48,220
Government | Engineering and Consulting
Revenue
Revenue	19,610	16,338	37,705	31,791
Utilities
Revenue
Revenue	50,108	48,270	100,658	96,728
Utilities | Energy
Revenue
Revenue	50,032	48,114	100,523	96,551
Utilities | Engineering and Consulting
Revenue
Revenue	76	156	135	177
Time-and-Materials Contract
Revenue
Revenue	25,390	20,927	47,653	42,746
Time-and-Materials Contract | Energy
Revenue
Revenue	8,947	7,587	16,656	16,405
Time-and-Materials Contract | Engineering and Consulting
Revenue
Revenue	16,443	13,340	30,997	26,341
Unit-based Contract
Revenue
Revenue	43,718	46,299	92,261	92,240
Unit-based Contract | Energy
Revenue
Revenue	39,900	42,544	84,827	85,501
Unit-based Contract | Engineering and Consulting
Revenue
Revenue	3,818	3,755	7,434	6,739
Fixed-Price Contract
Revenue
Revenue	49,969	35,419	81,766	59,497
Fixed-Price Contract | Energy
Revenue
Revenue	49,168	34,545	79,817	57,655
Fixed-Price Contract | Engineering and Consulting
Revenue
Revenue	$ 801	$ 874	$ 1,949	$ 1,842

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