Business Segment Information (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

Summarized segment information is as follows (in thousands):

Three Months Ended September 30,

	Transportation		Water		Specialty		Materials			Total
2018
Total revenue from reportable segments	$	610,847	$	124,292	$	190,836	$	194,586		$	1,120,561
Elimination of intersegment revenue		—		—		—		(64,970	)		(64,970	)
Revenue from external customers		610,847		124,292		190,836		129,616			1,055,591
Gross profit		70,976		24,103		28,099		21,313			144,491
Depreciation, depletion and amortization		7,592		11,191		7,569		6,496			32,848
2017
Total revenue from reportable segments	$	624,727	$	36,378	$	197,886	$	180,265		$	1,039,256
Elimination of intersegment revenue		—		—		—		(82,130	)		(82,130	)
Revenue from external customers		624,727		36,378		197,886		98,135			957,126
Gross profit		65,540		1,805		27,797		19,388			114,530
Depreciation, depletion and amortization		5,820		550		2,626		5,824			14,820

Nine Months Ended September 30,

	Transportation		Water		Specialty		Materials			Total
2018
Total revenue from reportable segments	$	1,472,703	$	215,951	$	461,149	$	392,633		$	2,542,436
Elimination of intersegment revenue		—		—		—		(116,347	)		(116,347	)
Revenue from external customers		1,472,703		215,951		461,149		276,286			2,426,089
Gross profit		138,401		41,117		65,311		36,314			281,143
Depreciation, depletion and amortization		17,920		16,075		18,908		17,980			70,883
Segment assets		394,981		308,964		150,437		375,016			1,229,398
2017
Total revenue from reportable segments	$	1,423,396	$	100,944	$	452,265	$	352,129		$	2,328,734
Elimination of intersegment revenue		—		—		—		(140,295	)		(140,295	)
Revenue from external customers		1,423,396		100,944		452,265		211,834			2,188,439
Gross profit		119,907		9,772		56,736		27,811			214,226
Depreciation, depletion and amortization		16,047		1,716		6,635		16,439			40,837
Segment assets		372,028		8,130		87,366		287,821			755,345

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

A reconciliation of segment gross profit to consolidated income before provision for income taxes is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
(in thousands)	2018			2017			2018			2017
Total gross profit from reportable segments	$	144,491		$	114,530		$	281,143		$	214,226
Selling, general and administrative expenses		70,769			49,501			193,337			162,726
Acquisition and integration expenses		9,334			—			44,030			—
Gain on sales of property and equipment		(3,018	)		(1,753	)		(5,066	)		(2,830	)
Total other income		(383	)		(2,522	)		(1,869	)		(2,987	)
Income before provision for income taxes	$	67,789		$	69,304		$	50,711		$	57,317