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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues from unrelated entities	$ 2,158,728	$ 1,900,388
Total revenues	2,158,728	1,900,388
Operating income (loss)	102,310	78,004
Restructuring expenses	(275)	(90)
Net periodic pension (cost) income	406	737
Interest expense, net	(2,823)	(2,452)
Income from continuing operations before income taxes	99,893	76,289
Total assets	4,278,324		$ 4,088,807
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(27,414)	(25,370)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(22,611)	(21,665)
Total assets	341,408		448,644
UNITED STATES
Segment Reporting Information [Line Items]
Revenues from unrelated entities	2,051,203	1,793,498
Total revenues	2,051,203	1,793,498
Operating income (loss)	121,055	95,989
Total assets	3,769,416		3,493,784
UNITED STATES | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	528,070	454,752
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	752,409	684,750
UNITED STATES | United States Building Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	512,079	454,752
UNITED STATES | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	258,645	199,244
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	528,870	455,782
Total revenues	528,982	457,169
Operating income (loss)	42,951	35,851
Restructuring expenses	0	0
Total assets	737,743		702,112
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	755,277	687,975
Total revenues	759,764	691,783
Operating income (loss)	40,985	39,620
Total assets	1,180,531		1,080,829
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Segment Reporting Information [Line Items]
Total revenues	530,596	470,099
Operating income (loss)	27,483	17,077
Restructuring expenses	(275)	(90)
Total assets	975,444		846,221
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Total revenues	259,275	199,817
Operating income (loss)	9,636	3,441
Total assets	875,698		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	(800)	(1,030)
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	(2,868)	(3,225)
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	107,525	106,890
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member]
Segment Reporting Information [Line Items]
Total revenues	107,525	106,890
Operating income (loss)	4,141	$ 3,770
Total assets	$ 167,500		$ 146,379

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