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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues from unrelated entities	$ 1,891,732	$ 1,744,970
Total revenues	1,891,732	1,744,970
Operating income (loss)	82,774	55,615
Restructuring expenses	(565)	(91)
Interest expense	(3,071)	(2,376)
Interest income	257	165
Income from continuing operations before income taxes	79,960	53,404
Total assets	3,805,162		$ 3,852,438
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	(24,542)	(22,207)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(21,060)	(20,957)
Total assets	413,923		557,275
UNITED STATES
Segment Reporting Information [Line Items]
Revenues from unrelated entities	1,812,714	1,657,334
Total revenues	1,812,714	1,657,334
Operating income (loss)	102,720	73,352
Total assets	3,276,288		3,190,082
UNITED STATES | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	443,016	348,289
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	671,129	608,428
UNITED STATES | United States Building Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	440,030	443,113
UNITED STATES | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	258,539	257,504
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Total revenues	444,016	354,104
Operating income (loss)	31,034	16,707
Total assets	617,529		631,581
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]
Segment Reporting Information [Line Items]
Total revenues	679,391	611,770
Operating income (loss)	40,433	23,781
Restructuring expenses	(62)	0
Total assets	958,733		954,633
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]
Segment Reporting Information [Line Items]
Total revenues	454,944	455,797
Operating income (loss)	14,209	13,998
Restructuring expenses	(503)	(91)
Total assets	798,606		753,434
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]
Segment Reporting Information [Line Items]
Total revenues	258,905	257,870
Operating income (loss)	17,044	18,866
Total assets	901,420		850,434
UNITED KINGDOM | United Kingdom Building Services [Member]
Segment Reporting Information [Line Items]
Revenues from unrelated entities	79,018	87,636
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member]
Segment Reporting Information [Line Items]
Total revenues	79,018	87,636
Operating income (loss)	1,679	$ 3,311
Total assets	$ 114,951		$ 105,081

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