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Goodwill and Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill by reportable segments during the years ended December 31, 2016 and 2015 were as follows (in thousands):

	United States electrical construction and facilities services segment				United States mechanical construction and facilities services segment				United States building services segment				United States industrial services segment				Total
Balance at December 31, 2014	$	3,823			$	217,255			$	228,385			$	384,639			$	834,102
Acquisitions, sales and purchase price adjustments	—				8,816				252				—				9,068
Balance at December 31, 2015	3,823				226,071				228,637				384,639				843,170
Acquisitions, sales and purchase price adjustments	119,777				525				16,156				—				136,458
Balance at December 31, 2016	$	123,600			$	226,596			$	244,793			$	384,639			$	979,628

Schedule of Intangible Assets

Identifiable intangible assets as of December 31, 2016 and 2015 consist of the following (in thousands):

	December 31, 2016
	Gross Carrying Amount				Accumulated Amortization				Accumulated Impairment Charge				Total
Contract backlog	$	48,645			$	(48,412	)		$	—			$	233
Developed technology/Vendor network	95,661				(45,616		)		—				50,045
Customer relationships	466,556				(173,156		)		(4,834		)		288,566
Non-competition agreements	10,220				(10,041		)		—				179
Trade names (amortized)	32,848				(15,847		)		—				17,001
Trade names (unamortized)	183,239				—				(51,865		)		131,374
Total	$	837,169			$	(293,072	)		$	(56,699	)		$	487,398

	December 31, 2015
	Gross Carrying Amount				Accumulated Amortization				Accumulated Impairment Charge				Total
Contract backlog	$	47,745			$	(47,745	)		$	—			$	—
Developed technology/Vendor network	95,661				(40,482		)		—				55,179
Customer relationships	430,356				(141,695		)		(4,834		)		283,827
Non-competition agreements	10,220				(9,832		)		—				388
Trade names (amortized)	21,248				(12,410		)		—				8,838
Trade names (unamortized)	174,039				—				(49,437		)		124,602
Total	$	779,269			$	(252,164	)		$	(54,271	)		$	472,834

Schedule of Estimated Future Amortization Expense

The following table presents the estimated future amortization expense of identifiable intangible assets in the following years (in thousands):

2017	$	39,210
2018	36,808
2019	34,826
2020	34,645
2021	33,851
Thereafter	176,684
	$	356,024

X

- Definition

Tabular disclosure of finite and indefinite lived intangible assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

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Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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