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Goodwill by Operating Segment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 611,473
Changes to goodwill	1,000
Balance at end of period	612,473
Contract Drilling
Goodwill [Line Items]
Balance at beginning of period	395,060
Changes to goodwill	0
Balance at end of period	395,060
Pressure Pumping
Goodwill [Line Items]
Balance at beginning of period	121,444
Changes to goodwill	0
Balance at end of period	121,444
Directional Drilling
Goodwill [Line Items]
Balance at beginning of period	88,685
Changes to goodwill	1,000
Balance at end of period	89,685
Oilfield Rentals
Goodwill [Line Items]
Balance at beginning of period	6,284
Changes to goodwill	0
Balance at end of period	$ 6,284

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

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.

+ References

No definition available.

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- Definition

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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