Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2025

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

See details in the following tables (dollars in thousands):

	Three Months Ended September 30,								Nine Months Ended September 30,
Revenue by Service Provided	2025				2024				2025				2024
Mechanical Segment	$	1,810,462	73.9	%	$	1,438,617	79.4	%	$	4,851,349	75.1	%	$	4,075,305	79.0	%
Electrical Segment		640,507	26.1	%		373,749	20.6	%		1,604,225	24.9	%		1,084,367	21.0	%
Total	$	2,450,969	100.0	%	$	1,812,366	100.0	%	$	6,455,574	100.0	%	$	5,159,672	100.0	%
	Three Months Ended September 30,								Nine Months Ended September 30,
Revenue by Type of Customer	2025				2024				2025				2024
Technology	$	1,122,528	45.8	%	$	615,398	34.0	%	$	2,734,280	42.4	%	$	1,641,525	31.8	%
Manufacturing		543,110	22.2	%		452,157	24.9	%		1,468,936	22.7	%		1,439,772	27.9	%
Healthcare		206,965	8.5	%		149,974	8.3	%		589,848	9.1	%		424,450	8.2	%
Education		171,707	7.0	%		195,737	10.8	%		527,794	8.2	%		523,153	10.1	%
Office Buildings		125,458	5.1	%		109,233	6.0	%		358,445	5.5	%		326,137	6.3	%
Government		122,284	5.0	%		92,555	5.1	%		326,318	5.1	%		271,429	5.3	%
Retail, Restaurants and Entertainment		88,503	3.6	%		114,572	6.3	%		250,619	3.9	%		309,658	6.0	%
Multi-Family and Residential		35,342	1.4	%		33,838	1.9	%		96,909	1.5	%		110,870	2.2	%
Other		35,072	1.4	%		48,902	2.7	%		102,425	1.6	%		112,678	2.2	%
Total	$	2,450,969	100.0	%	$	1,812,366	100.0	%	$	6,455,574	100.0	%	$	5,159,672	100.0	%

	Three Months Ended September 30,								Nine Months Ended September 30,
Revenue by Activity Type	2025				2024				2025				2024
New Construction	$	1,597,452	65.2	%	$	949,035	52.4	%	$	3,919,402	60.7	%	$	2,930,283	56.8	%
Existing Building Construction		527,139	21.5	%		570,288	31.5	%		1,626,978	25.2	%		1,407,231	27.3	%
Service Projects		150,383	6.1	%		125,249	6.9	%		415,868	6.5	%		355,643	6.9	%
Service Calls, Maintenance and Monitoring		175,995	7.2	%		167,794	9.2	%		493,326	7.6	%		466,515	9.0	%
Total	$	2,450,969	100.0	%	$	1,812,366	100.0	%	$	6,455,574	100.0	%	$	5,159,672	100.0	%

Schedule of contract assets and liabilities

Contract assets and liabilities in the Consolidated Balance Sheet consisted of the following amounts as of September 30, 2025 and December 31, 2024 (in thousands):

	September 30, 2025		December 31, 2024
Contract assets:
Costs and estimated earnings in excess of billings, less allowance for credit losses	$	163,350	$	91,681
Contract liabilities:
Billings in excess of costs and estimated earnings and deferred revenue	$	1,734,272	$	1,149,257