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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues from unrelated entities	$ 2,324,202	$ 1,953,886	$ 4,482,930	$ 3,854,274
Total revenues	2,324,202	1,953,886	4,482,930	3,854,274
Operating income (loss)	119,959	99,656	222,269	177,660
Restructuring expenses	(173)	(374)	(448)	(464)
Impairment loss on identifiable intangible assets	0	(907)	0	(907)
Net periodic pension (cost) income	400	717	806	1,454
Interest expense, net	(3,231)	(2,823)	(6,054)	(5,275)
Income from continuing operations before income taxes	117,128	97,550	217,021	173,839
Total assets	4,393,578		4,393,578		$ 4,088,807
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(31,271)	(27,969)	(58,685)	(53,339)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(27,110)	(20,730)	(49,721)	(42,395)
Total assets	299,735		299,735		448,644
UNITED STATES
Segment Reporting Information [Line Items]
Revenues from unrelated entities	2,211,646	1,848,379	4,262,849	3,641,877
Total revenues	2,211,646	1,848,379	4,262,849	3,641,877
Operating income (loss)	141,766	117,066	262,821	213,055
Total assets	3,925,008		3,925,008		3,493,784
UNITED STATES | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	569,402	479,542	1,097,472	934,294
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	823,086	723,882	1,575,495	1,408,632
UNITED STATES | United States Building Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	523,698	461,033	1,035,777	915,785
UNITED STATES | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	295,460	183,922	554,105	383,166
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	570,021	481,011	1,098,891	936,793
Total revenues	570,077	481,379	1,099,059	938,548
Operating income (loss)	43,799	35,985	86,750	71,836
Restructuring expenses			0	0
Total assets	810,170		810,170		702,112
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	825,365	726,866	1,580,642	1,414,841
Total revenues	827,952	733,551	1,587,716	1,425,334
Operating income (loss)	53,954	57,417	94,939	97,037
Total assets	1,201,345		1,201,345		1,080,829
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Segment Reporting Information [Line Items]
Total revenues	541,911	476,775	1,072,507	946,874
Operating income (loss)	28,001	22,430	55,484	39,507
Restructuring expenses			(448)	(464)
Total assets	994,117		994,117		846,221
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Total revenues	302,977	184,643	562,252	384,460
Operating income (loss)	16,012	1,234	25,648	4,675
Total assets	919,376		919,376		864,622
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Restructuring expenses			0	0
UNITED STATES | Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	(619)	(1,469)	(1,419)	(2,499)
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	(2,279)	(2,984)	(5,147)	(6,209)
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	112,556	105,507	220,081	212,397
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Total revenues	112,556	105,507	220,081	212,397
Operating income (loss)	5,476	$ 4,601	9,617	$ 8,371
Total assets	$ 168,835		$ 168,835		$ 146,379

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