Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Amortization of deferred financing costs	$ 194
Amortization expense of intangible assets	200	$ 8,500	$ 8,900
Operating lease obligation, noncurrent	$ 12,300
Trade names
Summary Of Significant Accounting Policies [Line Items]
Amortization period of intangible assets	15 years
Developed technology
Summary Of Significant Accounting Policies [Line Items]
Amortization period of intangible assets	5 years
Well service units and equipment | Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Well service units and equipment | Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives	15 years
Term Loan
Summary Of Significant Accounting Policies [Line Items]
Amortization of deferred financing costs	$ 300	$ 6,000	$ 3,100