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Property and Equipment - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Rigs	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Rigs
Property Plant And Equipment [Line Items]
Impairment charge for the write-down of drilling equipment			$ 0
Pressure Pumping
Property Plant And Equipment [Line Items]
Impairment charge for the write-down of drilling equipment	$ 17,400,000	$ 0	$ 0
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups	58.00%
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%
Directional Drilling
Property Plant And Equipment [Line Items]
Percentage of excepted cash flows on undiscounted basis exceeding the carrying values of asset groups	9.00%
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%
Rigs and Spare Rig Components That Would No Longer Be Marketed
Property Plant And Equipment [Line Items]
Number of rigs | Rigs	42
Impairment charge for the write-down of drilling equipment	$ 48,400,000	$ 29,000,000
Mechanically Powered Drilling Rigs That Remain Marketed But are Not Operating
Property Plant And Equipment [Line Items]
Number of rigs | Rigs			19

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

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- Definition

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

+ References

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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