Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 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 June 30,								Six Months Ended June 30,
Revenue by Service Provided	2025				2024				2025				2024
Mechanical Segment	$	1,638,672	75.4	%	$	1,451,679	80.2	%	$	3,040,887	75.9	%	$	2,636,688	78.8	%
Electrical Segment		534,647	24.6	%		358,611	19.8	%		963,718	24.1	%		710,618	21.2	%
Total	$	2,173,319	100.0	%	$	1,810,290	100.0	%	$	4,004,605	100.0	%	$	3,347,306	100.0	%
	Three Months Ended June 30,								Six Months Ended June 30,
Revenue by Type of Customer	2025				2024				2025				2024
Technology	$	934,199	43.0	%	$	561,313	31.0	%	$	1,611,752	40.2	%	$	1,026,127	30.7	%
Manufacturing		473,040	21.8	%		526,215	29.0	%		925,826	23.1	%		987,615	29.5	%
Healthcare		200,341	9.2	%		140,747	7.8	%		382,883	9.6	%		274,476	8.2	%
Education		194,845	8.9	%		193,433	10.7	%		356,087	8.9	%		327,416	9.8	%
Office Buildings		110,461	5.1	%		115,012	6.4	%		232,987	5.9	%		216,904	6.5	%
Government		107,753	5.0	%		91,073	5.0	%		204,034	5.1	%		178,874	5.3	%
Retail, Restaurants and Entertainment		85,107	3.9	%		114,501	6.3	%		162,116	4.0	%		195,086	5.8	%
Multi-Family and Residential		33,214	1.5	%		36,181	2.0	%		61,567	1.5	%		77,032	2.3	%
Other		34,359	1.6	%		31,815	1.8	%		67,353	1.7	%		63,776	1.9	%
Total	$	2,173,319	100.0	%	$	1,810,290	100.0	%	$	4,004,605	100.0	%	$	3,347,306	100.0	%

	Three Months Ended June 30,								Six Months Ended June 30,
Revenue by Activity Type	2025				2024				2025				2024
New Construction	$	1,256,866	57.9	%	$	1,082,272	59.8	%	$	2,321,950	58.0	%	$	1,981,248	59.2	%
Existing Building Construction		607,236	27.9	%		446,574	24.7	%		1,099,839	27.5	%		836,943	25.0	%
Service Projects		146,271	6.7	%		126,280	6.9	%		265,485	6.6	%		230,394	6.9	%
Service Calls, Maintenance and Monitoring		162,946	7.5	%		155,164	8.6	%		317,331	7.9	%		298,721	8.9	%
Total	$	2,173,319	100.0	%	$	1,810,290	100.0	%	$	4,004,605	100.0	%	$	3,347,306	100.0	%

Schedule of contract assets and liabilities

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

	June 30, 2025		December 31, 2024
Contract assets:
Costs and estimated earnings in excess of billings, less allowance for credit losses	$	203,404	$	91,681
Contract liabilities:
Billings in excess of costs and estimated earnings and deferred revenue	$	1,546,306	$	1,149,257