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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from unrelated entities	$ 1,900,388	$ 1,891,732
Total revenues	1,900,388	1,891,732
Operating income (loss)	78,741	82,774
Restructuring expenses	(90)	(565)
Interest expense	(2,996)	(3,071)
Interest income	544	257
Income from continuing operations before income taxes	76,289	79,960
Total assets	3,841,999		$ 3,965,904
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(25,370)	(24,542)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(21,665)	(21,060)
Total assets	460,711		582,403
UNITED STATES
Segment Reporting Information [Line Items]
Revenues from unrelated entities	1,793,498	1,812,714
Total revenues	1,793,498	1,812,714
Operating income (loss)	95,926	102,720
Total assets	3,223,908		3,251,695
UNITED STATES | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	454,752	443,016
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	698,847	671,129
UNITED STATES | United States Building Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	454,752	440,030
UNITED STATES | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	185,147	258,539
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Total revenues	457,169	444,016
Operating income (loss)	35,851	31,034
Restructuring expenses	0	0
Total assets	605,483		617,471
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Total revenues	705,880	679,391
Operating income (loss)	39,572	40,433
Restructuring expenses	0	(62)
Total assets	1,058,495		1,097,240
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Segment Reporting Information [Line Items]
Total revenues	470,099	454,944
Operating income (loss)	17,034	14,209
Restructuring expenses	(90)	(503)
Total assets	783,271		764,085
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Total revenues	185,720	258,905
Operating income (loss)	3,469	17,044
Total assets	776,659		772,899
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	106,890	79,018
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Total revenues	106,890	79,018
Operating income (loss)	4,570	$ 1,679
Total assets	$ 157,380		$ 131,806

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