Business Combinations - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended		7 Months Ended	8 Months Ended	12 Months Ended
	May 01, 2018	Aug. 16, 2017	Apr. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Aug. 16, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Consideration paid, net of cash acquired						$ 742,841	$ 18,636
Goodwill				$ 414,257		414,257				$ 272,079
Total cash consideration for pre-existing contracted asset sale						159,196	152,087
EPMH
Business Acquisition [Line Items]
Consideration paid, net of cash acquired	$ 742,800
Cash acquired	19,100
Revenues from acquiree included in Income Statement				41,700		41,700
Net loss from acquiree included in Income Statement				700		700
Non-recurring transaction costs attributable to business combination excluded from pro-forma information				(19,693)	$ (13,196)	(70,539)	$ (8,097)
Goodwill	$ 139,378
EPMH | Acquisition-related Costs
Business Acquisition [Line Items]
Non-recurring transaction costs attributable to business combination excluded from pro-forma information						15,200
EPMH | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition-related costs				$ 8,800		$ 10,900
White Armor acquisition
Business Acquisition [Line Items]
Cash consideration paid			$ 18,600
Goodwill			3,900
Identifiable intangible assets			12,800
Other net assets			$ 1,900
White Armor acquisition | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition-related costs										200
MS Sand
Business Acquisition [Line Items]
Consideration paid, net of cash acquired		$ 95,400
Cash acquired		2,200
Non-recurring transaction costs attributable to business combination excluded from pro-forma information										(143,604)	$ 55,835
Goodwill										$ 25,322
Net working capital adjustment		(500)
Additional consideration paid		$ 6,100
Total cash consideration for pre-existing contracted asset sale									$ 101,000
MS Sand | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition-related costs								$ 1,000