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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 152,882	$ 186,797
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,502	2,008
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, amortization and impairment	101,674	111,438
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, amortization and impairment	37,385	42,671
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Depreciation and amortization	6,497	10,421
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 5,824	$ 20,259

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- Definition

Depreciation, amortization and impairment.

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- Definition

Depreciation depletion amortization and impairment.

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- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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