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Acquisitions - 2017, 2016 and 2015 Acquisitions (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Jul. 20, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill acquired										$ 302,408	$ 45,186
Revenues		$ 2,478,627	$ 2,609,307	$ 2,200,374	$ 2,178,170	$ 2,102,966	$ 2,042,186	$ 1,792,430	$ 1,713,737	9,466,478	7,651,319	$ 7,572,436
Income (loss) from continuing operations before income taxes										353,757	307,686	228,675
Electric Power Division
Business Acquisition [Line Items]
Goodwill acquired										5,866	24,168
Oil And Gas Division
Business Acquisition [Line Items]
Goodwill acquired										296,542	21,018
Acquisitions 2017, other than Stronghold
Business Acquisition [Line Items]
Goodwill acquired										5,866
Acquisitions 2017, other than Stronghold | Electric Power Division
Business Acquisition [Line Items]
Goodwill acquired										5,900
Stronghold
Business Acquisition [Line Items]
Goodwill acquired	$ 296,542
Stronghold | Oil And Gas Division
Business Acquisition [Line Items]
Goodwill acquired										296,500
Acquisitions 2016
Business Acquisition [Line Items]
Goodwill acquired											43,923
Goodwill expected to be deductible for income tax		2,000								2,000
Revenues											68,500
Income (loss) from continuing operations before income taxes											(5,600)
Acquisition costs											300
Acquisitions 2016 | Electric Power Division
Business Acquisition [Line Items]
Goodwill acquired											23,600
Acquisitions 2016 | Oil And Gas Division
Business Acquisition [Line Items]
Goodwill acquired											$ 20,300
Acquisitions 2015
Business Acquisition [Line Items]
Revenues												104,600
Income (loss) from continuing operations before income taxes												300
Acquisition costs												3,600
Acquisitions 2015 | Electric Power Division
Business Acquisition [Line Items]
Goodwill acquired												31,500
Acquisitions 2015 | Oil And Gas Division
Business Acquisition [Line Items]
Goodwill acquired												$ 20,400
Acquisitions 2017
Business Acquisition [Line Items]
Goodwill acquired										302,400
Goodwill expected to be deductible for income tax		$ 302,400								302,400
Revenues										207,400
Income (loss) from continuing operations before income taxes										(8,100)
Acquisition costs										$ 5,400

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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