Business Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 807,119	$ 762,913	$ 1,370,498	$ 1,231,313
Gross profit	80,369	74,570	136,652	99,696
Segment assets	2,556,325	1,803,145	2,556,325	1,803,145	$ 1,871,978
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	852,368	806,974	1,423,347	1,289,478
Gross profit	80,369	74,570	136,652	99,696
Depreciation, depletion and amortization	25,037	13,939	38,100	26,017
Segment assets	1,247,273	750,415	1,247,273	750,415
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	(45,249)	(44,061)	(52,849)	(58,165)
Construction Segment [Member]
Segment Reporting Information [Line Items]
Total revenue	432,225	429,269	701,468	656,118
Construction Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	432,225	429,269	701,468	656,118
Gross profit	61,551	60,900	99,947	88,229
Depreciation, depletion and amortization	9,645	5,441	14,699	10,435
Segment assets	608,116	142,456	608,116	142,456
Construction Segment [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Large Project Construction [Member]
Segment Reporting Information [Line Items]
Total revenue	273,946	254,463	522,360	461,496
Large Project Construction [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	273,946	254,463	522,360	461,496
Gross profit	1,338	489	21,704	3,044
Depreciation, depletion and amortization	9,318	3,081	11,917	4,967
Segment assets	335,036	312,891	335,036	312,891
Large Project Construction [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Construction Materials [Member]
Segment Reporting Information [Line Items]
Total revenue	100,948	79,181	146,670	113,699
Construction Materials [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	146,197	123,242	199,519	171,864
Gross profit	17,480	13,181	15,001	8,423
Depreciation, depletion and amortization	6,074	5,417	11,484	10,615
Segment assets	304,121	295,068	304,121	295,068
Construction Materials [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenue	$ (45,249)	$ (44,061)	$ (52,849)	$ (58,165)