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Property and Equipment - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) Rigs	Dec. 31, 2018 USD ($) Rigs	Mar. 31, 2020	Sep. 30, 2019
Property Plant And Equipment [Line Items]
Impairment charge of drilling equipment	$ 8,300,000
Pressure Pumping
Property Plant And Equipment [Line Items]
Impairment charge of drilling equipment		$ 0	$ 20,500,000	$ 17,400,000
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups				58.00%	22.00%	54.00%
Directional Drilling
Property Plant And Equipment [Line Items]
Impairment charge of drilling equipment		$ 0	8,400,000	$ 0
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups				9.00%	3.00%	23.00%
Contract Drilling
Property Plant And Equipment [Line Items]
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups				38.00%	15.00%	35.00%
Oilfield Rentals
Property Plant And Equipment [Line Items]
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups				23.00%	9.00%	7.00%
Rigs and Spare Rig Components That Would No Longer Be Marketed
Property Plant And Equipment [Line Items]
Impairment charge of drilling equipment	$ 8,300,000		$ 173,000,000	$ 48,400,000
Number of rigs | Rigs			36	42

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Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of long-lived assets.

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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
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-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
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-URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760

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