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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from unrelated entities	$ 2,047,049	$ 1,886,691	$ 5,901,323	$ 5,674,360
Total revenues	2,047,049	1,886,691	5,901,323	5,674,360
Operating income (loss)	111,776	106,044	289,436	280,845
Restructuring expenses	(229)	(46)	(693)	(954)
Impairment loss on identifiable intangible assets	0	0	(907)	0
Net periodic pension (cost) income	615	415	2,069	1,209
Interest expense	(3,588)	(3,324)	(10,041)	(9,464)
Interest income	852	277	2,030	607
Income from continuing operations before income taxes	109,655	103,412	283,494	273,197
Total assets	3,995,893		3,995,893		$ 3,965,904
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(28,887)	(25,204)	(82,226)	(75,992)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(23,113)	(22,632)	(65,508)	(63,755)
Total assets	459,225		459,225		582,403
UNITED STATES
Segment Reporting Information [Line Items]
Revenues from unrelated entities	1,946,483	1,800,789	5,588,360	5,430,282
Total revenues	1,946,483	1,800,789	5,588,360	5,430,282
Operating income (loss)	130,661	125,277	343,716	337,873
Total assets	3,392,787		3,392,787		3,251,695
UNITED STATES | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	485,974	457,919	1,420,268	1,350,157
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	772,332	760,084	2,211,836	2,173,030
UNITED STATES | United States Building Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	473,701	437,107	1,389,486	1,315,401
UNITED STATES | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	214,476	145,679	566,770	591,694
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	486,349		1,423,142
Total revenues	486,642	460,066	1,425,190	1,355,206
Operating income (loss)	34,473	46,583	106,309	109,735
Restructuring expenses			0	0
Total assets	650,693		650,693		617,471
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	775,316		2,221,029
Total revenues	783,454	767,398	2,239,660	2,197,231
Operating income (loss)	58,689	57,503	155,864	151,028
Restructuring expenses			0	(181)
Total assets	1,109,064		1,109,064		1,097,240
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Segment Reporting Information [Line Items]
Total revenues	490,624	451,396	1,437,498	1,360,189
Operating income (loss)	29,315	26,035	68,822	60,537
Restructuring expenses			(693)	(773)
Total assets	830,019		830,019		764,085
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Total revenues	214,650	147,133	568,238	593,648
Operating income (loss)	8,184	(4,844)	12,721	16,573
Total assets	803,011		803,011		772,899
UNITED STATES | Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	(375)		(2,874)
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	(2,984)		(9,193)
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	100,566	85,902	312,963	244,078
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Total revenues	100,566	85,902	312,963	244,078
Operating income (loss)	4,457	$ 3,445	12,828	$ 7,681
Total assets	$ 143,881		$ 143,881		$ 131,806

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