Average oil price per barrel.

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- Definition

Goodwill and intangible assets disclosure.

+ References

No definition available.

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- Definition

Percentage fair value exceeds carrying value.

+ References

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Goodwill and Intangible Assets - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2015 $ / bbl	Sep. 30, 2015 USD ($) $ / bbl	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Goodwill And Intangible Assets Disclosure [Line Items]
Average oil price per barrel \| $ / bbl	38.22	46.42
Goodwill impairment charge					$ 124,561,000
Impairment			$ 0	$ 0	0
Amortization expense on intangible assets			24,300,000	3,600,000	$ 3,600,000
Contract Drilling
Goodwill And Intangible Assets Disclosure [Line Items]
Accumulated impairment losses			$ 0	$ 0
Percentage fair value exceeds carrying value		15.00%			16.00%
Goodwill impairment charge		$ 0			$ 0
Pressure Pumping
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill impairment charge		$ 125,000,000