Acquisitions, Goodwill and Other Intangible Assets, Net - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Acquisition consideration:
Cash, net of cash acquired		$ 69,388	$ 635,763	$ 1,244,603
Identifiable assets acquired and liabilities assumed:
Goodwill		2,126,366	$ 2,045,041	1,520,600
Business Combination Bargain Purchase Gain Recognized Statement of Income or Comprehensive Income Extensible Enumeration not Disclosed Flag			Bargain purchase gain
2022 Acquisitions
Acquisition consideration:
Cash, net of cash acquired		613,200
Shares transferred		173,700
Estimated fair value of warrants		10,300
Estimated fair value of contingent consideration		2,800
Total consideration		800,000
Identifiable assets acquired and liabilities assumed:
Accounts receivable and contract assets		576,100
Current assets		36,100
Property and equipment		252,600
Long-term assets, primarily operating lease right-of-use assets		40,900
Amortizing intangible assets		368,100
Accounts payable		(141,100)
Contract liabilities		(152,800)
Current liabilities, primarily accrued expenses		(327,600)
Long-term debt, including finance lease obligations		(331,000)
Long-term liabilities, primarily operating lease liabilities and deferred income taxes		(105,500)
Total identifiable net assets		215,800
Goodwill		584,200
Total net assets acquired, including goodwill		800,000
IEA
Acquisition consideration:
Cash, net of cash acquired		564,500
Shares transferred		173,700
Estimated fair value of warrants		10,300
Estimated fair value of contingent consideration		0
Total consideration		748,500
Identifiable assets acquired and liabilities assumed:
Accounts receivable and contract assets		570,000
Current assets		34,500
Property and equipment		222,500
Long-term assets, primarily operating lease right-of-use assets		40,600
Amortizing intangible assets		362,200
Accounts payable		(136,500)
Contract liabilities		(151,300)
Current liabilities, primarily accrued expenses		(326,200)
Long-term debt, including finance lease obligations		(330,800)
Long-term liabilities, primarily operating lease liabilities and deferred income taxes		(105,300)
Total identifiable net assets		179,700
Goodwill		568,800
Total net assets acquired, including goodwill		748,500
All other
Acquisition consideration:
Cash, net of cash acquired		48,700
Shares transferred		0
Estimated fair value of warrants		0
Estimated fair value of contingent consideration		2,800
Total consideration		51,500
Identifiable assets acquired and liabilities assumed:
Accounts receivable and contract assets		6,100
Current assets		1,600
Property and equipment		30,100
Long-term assets, primarily operating lease right-of-use assets		300
Amortizing intangible assets		5,900
Accounts payable		(4,600)
Contract liabilities		(1,500)
Current liabilities, primarily accrued expenses		(1,400)
Long-term debt, including finance lease obligations		(200)
Long-term liabilities, primarily operating lease liabilities and deferred income taxes		(200)
Total identifiable net assets		36,100
Goodwill		15,400
Total net assets acquired, including goodwill		51,500
2021 Acquisitions
Acquisition consideration:
Cash, net of cash acquired			$ 1,279,100
Shares transferred			181,700
Estimated fair value of contingent consideration			104,900	$ 105,000
Total consideration			1,565,700
Identifiable assets acquired and liabilities assumed:
Accounts receivable and contract assets			675,200
Current assets			46,200
Property and equipment			499,200
Long-term assets, primarily operating lease right-of-use assets			166,800
Amortizing intangible assets			608,600
Accounts payable			(157,300)
Current liabilities, primarily accrued expenses			(297,900)
Long-term debt, including finance lease obligations			(4,600)
Long-term liabilities, primarily operating lease liabilities and deferred income taxes			(224,900)
Total identifiable net assets			1,311,300
Goodwill			258,000
Total net assets acquired, including goodwill			1,569,300
Bargain purchase gain			(3,600)
HMG
Acquisition consideration:
Cash, net of cash acquired			402,400
Shares transferred		182,000	181,700
Estimated fair value of contingent consideration			0
Total consideration			584,100
Identifiable assets acquired and liabilities assumed:
Accounts receivable and contract assets			409,000
Current assets			19,500
Property and equipment			248,600
Long-term assets, primarily operating lease right-of-use assets			84,900
Amortizing intangible assets			164,400
Accounts payable			(108,000)
Current liabilities, primarily accrued expenses			(157,200)
Long-term debt, including finance lease obligations			(200)
Long-term liabilities, primarily operating lease liabilities and deferred income taxes			(148,300)
Total identifiable net assets			512,700
Goodwill			71,400
Total net assets acquired, including goodwill			584,100
Bargain purchase gain			0
HMG | Contingent Consideration, Value Of Additional Payments
Acquisition consideration:
Estimated fair value of contingent consideration			65,000
Total consideration	$ 29,400
All other
Acquisition consideration:
Cash, net of cash acquired		$ 78,000	876,700
Shares transferred			0
Estimated fair value of contingent consideration			104,900
Total consideration			981,600
Identifiable assets acquired and liabilities assumed:
Accounts receivable and contract assets			266,200
Current assets			26,700
Property and equipment			250,600
Long-term assets, primarily operating lease right-of-use assets			81,900
Amortizing intangible assets			444,200
Accounts payable			(49,300)
Current liabilities, primarily accrued expenses			(140,700)
Long-term debt, including finance lease obligations			(4,400)
Long-term liabilities, primarily operating lease liabilities and deferred income taxes			(76,600)
Total identifiable net assets			798,600
Goodwill			186,600
Total net assets acquired, including goodwill			985,200
Bargain purchase gain			$ (3,600)