Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2022

Revenue from Contracts with Customers

Schedule of disaggregation of revenue

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

	Three Months Ended March 31,
Revenue by Service Provided	2022				2021
Mechanical Services	$	682,511	77.1	%	$	565,620	84.5	%
Electrical Services		202,705	22.9	%		104,141	15.5	%
Total	$	885,216	100.0	%	$	669,761	100.0	%
	Three Months Ended March 31,
Revenue by Type of Customer	2022				2021
Industrial	$	410,184	46.3	%	$	269,583	40.3	%
Education		89,446	10.1	%		92,457	13.8	%
Office Buildings		75,115	8.5	%		78,996	11.8	%
Healthcare		134,795	15.2	%		95,091	14.2	%
Government		57,465	6.5	%		43,165	6.4	%
Retail, Restaurants and Entertainment		65,582	7.4	%		44,576	6.7	%
Multi-Family and Residential		24,442	2.8	%		24,660	3.7	%
Other		28,187	3.2	%		21,233	3.1	%
Total	$	885,216	100.0	%	$	669,761	100.0	%
	Three Months Ended March 31,
Revenue by Activity Type	2022				2021
New Construction	$	429,418	48.5	%	$	302,061	45.1	%
Existing Building Construction		259,285	29.3	%		216,601	32.3	%
Service Projects		76,252	8.6	%		60,060	9.0	%
Service Calls, Maintenance and Monitoring		120,261	13.6	%		91,039	13.6	%
Total	$	885,216	100.0	%	$	669,761	100.0	%

Schedule of contract assets and liabilities

The following table presents the changes in contract assets and contract liabilities (in thousands):

	Three Months Ended March 31,					Year Ended December 31,
	2022				2021
	Contract		Contract		Contract		Contract
	Assets		Liabilities		Assets		Liabilities
Balance at beginning of period	$	29,900	$	307,380	$	18,622	$	226,237
Change due to acquisitions / disposals		(10)		52		10,356		36,523
Change related to credit allowance		31		—		(5)		—
Other changes in the period		(11,608)		21,135		927		44,620
Balance at end of period	$	18,313	$	328,567	$	29,900	$	307,380