Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Schedule of disaggregation or revenue

	Three Months Ended June 30,								Six Months Ended June 30,
Revenue by Service Provided	2019				2018				2019				2018
HVAC and Plumbing	$	504,253	77.5	%	$	484,011	90.5	%	$	986,243	83.0	%	$	908,028	90.8	%
Electrical Services		97,271	15.0	%		—	—			101,159	8.5	%		—	—
Building Automation Control Systems		20,262	3.1	%		26,261	4.9	%		49,276	4.1	%		46,306	4.6	%
Other		28,516	4.4	%		24,771	4.6	%		52,097	4.4	%		45,650	4.6	%
Total	$	650,302	100.0	%	$	535,043	100.0	%	$	1,188,775	100.0	%	$	999,984	100.0	%
	Three Months Ended June 30,								Six Months Ended June 30,
Revenue by Type of Customer	2019				2018				2019				2018
Industrial	$	198,002	30.5	%	$	114,077	21.3	%	$	366,662	30.8	%	$	214,177	21.4	%
Education		100,220	15.4	%		109,447	20.5	%		166,963	14.1	%		197,650	19.8	%
Office Buildings		105,483	16.2	%		79,309	14.8	%		171,695	14.4	%		148,429	14.9	%
Healthcare		87,878	13.5	%		71,930	13.4	%		179,901	15.1	%		135,113	13.5	%
Government		44,443	6.8	%		37,285	7.0	%		76,722	6.5	%		73,432	7.3	%
Retail, Restaurants and Entertainment		58,086	8.9	%		56,204	10.5	%		117,477	9.9	%		108,991	10.9	%
Multi-Family and Residential		29,061	4.5	%		36,040	6.7	%		59,296	5.0	%		69,092	6.9	%
Other		27,129	4.2	%		30,751	5.8	%		50,059	4.2	%		53,100	5.3	%
Total	$	650,302	100.0	%	$	535,043	100.0	%	$	1,188,775	100.0	%	$	999,984	100.0	%

	Three Months Ended June 30,								Six Months Ended June 30,
Revenue by Activity Type	2019				2018				2019				2018
New Construction	$	291,479	44.8	%	$	193,211	36.1	%	$	515,439	43.4	%	$	378,493	37.9	%
Existing Building Construction		199,398	30.7	%		200,040	37.4	%		381,694	32.1	%		356,798	35.7	%
Service Projects		58,808	9.0	%		51,900	9.7	%		109,192	9.2	%		94,333	9.4	%
Service Calls, Maintenance and Monitoring		100,617	15.5	%		89,892	16.8	%		182,450	15.3	%		170,360	17.0	%
Total	$	650,302	100.0	%	$	535,043	100.0	%	$	1,188,775	100.0	%	$	999,984	100.0	%

Schedule of contract assets and liabilities

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

	Six Months Ended				Year Ended
	June 30, 2019				December 31, 2018
	Contract		Contract		Contract		Contract
	Assets		Liabilities		Assets		Liabilities
Balance at beginning of period	$	10,213	$	130,986	$	30,116	$	106,005
Change due to acquisitions		6,953		31,604		2,833		8,195
Change due to conditional versus unconditional		(8,945)		—		6,244		—
Reclassified to unbilled accounts receivable		—		—		(28,980)		—
Change in timing for performance obligation to be satisfied		—		2,699		—		16,786
Balance at end of period	$	8,221	$	165,289	$	10,213	$	130,986

Schedule of lease asset and liabilities

The following table summarizes the lease asset and liabilities included in the consolidated Balance Sheet as follows (in thousands):

	June 30, 2019
Lease right-of-use assets	$	80,633
Lease liabilities:
Other current liabilities		13,185
Long-term lease liabilities		70,095
Total lease liabilities	$	83,280

Schedule of maturities of lease liabilities

The maturities of lease liabilities are as follows (in thousands):

Year ending December 31—
2019 (excluding the six months ended June 30, 2019)	$	8,445
2020		15,319
2021		13,626
2022		11,504
2023		9,657
Thereafter		39,846
Total Lease Payments		98,397
Less—Present Value Discount		(15,117)
Present Value of Lease Liabilities	$	83,280

Schedule of supplemental information related to leases

Supplemental information related to leases was as follows (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2019		June 30, 2019
Cash paid for amounts included in the measurement of lease liabilities	$	6,056	$	11,960
Lease right-of-use assets obtained in exchange for lease liabilities	$	3,544	$	3,718