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Property and Equipment - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Rigs	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Rigs	Sep. 30, 2017 USD ($)
Pressure Pumping
Property Plant And Equipment [Line Items]
Impairment charge for the write-down of drilling equipment	$ 17,400,000	$ 0
Rigs and Spare Rig Components That Would No Longer Be Marketed
Property Plant And Equipment [Line Items]
Number of rigs | Rigs	42		42
Impairment charge for the write-down of drilling equipment	$ 48,400,000		$ 48,400,000	$ 29,000,000

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760

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