Business Segments (Reportable Segments) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 861,027	$ 1,219,243	$ 1,813,181	$ 2,426,838
Loss from construction operations	(90,554)	68,753	(100,461)	118,457
Capital expenditures	16,817	9,025	28,845	18,860
Depreciation and amortization	18,283	35,261	38,521	62,135
Operating Segments
Segment Reporting Information [Line Items]
Revenue	906,235	1,340,226	1,953,819	2,705,488
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(45,208)	(120,983)	(140,638)	(278,650)
Corporate
Segment Reporting Information [Line Items]
Revenue	0
Loss from construction operations	(13,989)	(13,792)	(28,499)	(26,733)
Capital expenditures	295	339	508	392
Depreciation and amortization	2,360	2,767	4,695	5,537
Civil
Segment Reporting Information [Line Items]
Revenue	403,622	555,352	794,417	1,030,927
Civil \| Unfavorable Settlement due to Project in Maryland
Segment Reporting Information [Line Items]
Loss contingency	(16,200)		(16,200)
Loss contingency, after tax	$ (11,600)		$ (11,600)
Loss contingency, after tax, diluted (in dollars per share)	$ (0.23)		$ (0.23)
Civil \| Adverse Legal Ruling Pertaining to Bridge Project in the Northeast
Segment Reporting Information [Line Items]
Loss contingency			$ (25,500)
Loss contingency, after tax			$ (18,300)
Loss contingency, after tax, diluted (in dollars per share)			$ (0.36)
Civil \| Unfavorable Legal Ruling Pertaining To Mass-Transit Project In California
Segment Reporting Information [Line Items]
Loss contingency			$ (29,100)
Loss contingency, after tax			$ (22,900)
Loss contingency, after tax, diluted (in dollars per share)			$ (0.45)
Civil \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 453,215	643,055	$ 913,957	1,226,199
Loss from construction operations	(9,767)	75,073	(10,734)	125,178
Capital expenditures	15,656	8,616	26,831	18,180
Depreciation and amortization	15,025	31,178	32,025	53,891
Civil \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(49,593)	(87,703)	(119,540)	(195,272)
Building
Segment Reporting Information [Line Items]
Revenue	266,941	382,660	597,589	789,893
Building \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	262,556	415,801	618,534	872,971
Loss from construction operations	(67)	(2,488)	9,397	8,728
Capital expenditures	50	51	52	124
Depreciation and amortization	390	424	791	856
Building \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	4,385	(33,141)	(20,945)	(83,078)
Specialty Contractors
Segment Reporting Information [Line Items]
Revenue	190,464	$ 281,231	421,175	606,018
Specialty Contractors \| Unfavorable Adjustment due to Electrical Project in the Northeast
Segment Reporting Information [Line Items]
Loss contingency	(33,500)		(33,500)
Loss contingency, after tax	$ (24,200)		$ (24,200)
Loss contingency, after tax, diluted (in dollars per share)	$ (0.47)		$ (0.47)
Specialty Contractors \| Unfavorable Legal Appeal due to Electrical Project in the Northeast
Segment Reporting Information [Line Items]
Loss contingency	$ (17,800)		$ (17,800)
Loss contingency, after tax	$ (12,800)		$ (12,800)
Loss contingency, after tax, diluted (in dollars per share)	$ (0.25)		$ (0.25)
Specialty Contractors \| Favorable Legal Ruling Pertaining to Electrical Project in New York
Segment Reporting Information [Line Items]
Loss contingency, after tax, diluted (in dollars per share)		$ (0.28)
Favorable arbitration		$ (20,100)		20,100
Favorable arbitration, after tax		(14,600)		$ 14,600
Favorable arbitration, after tax, diluted (in dollars per share)				$ 0.28
Specialty Contractors \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 190,464	281,370	$ 421,328	$ 606,318
Loss from construction operations	(66,731)	9,960	(70,625)	11,284
Capital expenditures	816	19	1,454	164
Depreciation and amortization	508	892	1,010	1,851
Specialty Contractors \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	0	(139)	(153)	(300)
Total
Segment Reporting Information [Line Items]
Revenue	861,027	1,219,243	1,813,181	2,426,838
Total \| Operating Segments
Segment Reporting Information [Line Items]
Revenue	906,235	1,340,226	1,953,819	2,705,488
Loss from construction operations	(76,565)	82,545	(71,962)	145,190
Capital expenditures	16,522	8,686	28,337	18,468
Depreciation and amortization	15,923	32,494	33,826	56,598
Total \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	$ (45,208)	$ (120,983)	(140,638)	$ (278,650)
Civil and Building \| Unfavorable Adjustment due to Changes in Estimates on Transportation Project in the Northeast
Segment Reporting Information [Line Items]
Loss contingency			(14,600)
Loss contingency, after tax			$ (11,200)
Loss contingency, after tax, diluted (in dollars per share)			$ (0.22)

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