Acquisitions (Details) $ / shares in Units, $ in Millions				3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 16, 2017 USD ($) item $ / shares	Oct. 03, 2016 USD ($)	Jun. 24, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Purchase price allocation
Goodwill				$ 8.6		$ 8.6		$ 1.6
Magna
Purchase Price
Cash			$ 12.7
Total purchase price			12.7
Purchase price allocation
Cash			1.2
Accounts receivable			3.0
Prepaid expenses and other			1.2
Property, plant and equipment			8.8
Total assets acquired			14.3
Accounts payable			(1.0)
Accrued expenses			(0.6)
Total liabilities assumed			(1.6)
Net assets acquired/allocated purchase price			12.7
Business acquisition costs					$ 0.1		$ 0.1
Bayou
Acquisitions
Equity interest transferred (as a percent)		35.00%
Purchase Price
Cash		$ 17.5
Equity issued		33.0
Total purchase price		50.5
Purchase price allocation
Prepaid expenses and other		0.5
Total assets acquired		52.7
Accounts payable		(1.8)
Accrued expenses		(1.0)
Other long-term liabilities		(1.0)
Total liabilities assumed		(3.8)
Goodwill		1.6
Allocated purchase price		50.5
Business acquisition costs								$ 0.4
ESCO
Acquisitions
Number of well service rigs | item	49
Purchase Price
Cash	$ 47.7
Equity issued	5.0
Secured Seller's Notes	7.0
Total purchase price	59.7
Purchase price allocation
Accounts receivable	6.6
Property, plant and equipment	45.9
Intangibles	2.2
Other assets	0.4
Total assets acquired	55.1
Accounts payable	(0.5)
Accrued expenses	(1.9)
Total liabilities assumed	(2.4)
Goodwill	7.0
Allocated purchase price	59.7
Supplemental Pro Form Information
Revenue						126.5	90.4
Operating Loss						(17.2)	(19.4)
Net Loss						(23.7)	$ (26.7)
Revenue of acquiree				$ 5.4		$ 5.4
Class A Common Stock | ESCO
Purchase Price
Equity issued	$ 5.0
Share price (in dollars per share) | $ / shares	$ 14.50
Property, plant and equipment | Bayou
Purchase price allocation
Property, plant and equipment		40.0
Land | Bayou
Purchase price allocation
Property, plant and equipment		0.6
Building and site improvements | Bayou
Purchase price allocation
Property, plant and equipment		2.3
Tradenames | Magna
Purchase price allocation
Intangibles			$ 0.1
Customer relationships | Bayou
Purchase price allocation
Intangibles		$ 9.3