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Business Segments - Identifiable Assets (Detail) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 3,870,284	$ 4,439,615
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	236,965	261,019
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		2,729,381	3,190,463
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		636,140	695,570
Operating Segments | Directional Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		155,350	164,273
Other Operations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 112,448	$ 128,290
[1] Corporate assets primarily include cash on hand and certain property and equipment.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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+ References

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