Goodwill by Operating Segment (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 210,795
Changes to goodwill	0
Ending Balance	210,795
Contract Drilling
Goodwill [Line Items]
Beginning Balance	86,234
Changes to goodwill	0
Ending Balance	86,234
Pressure Pumping
Goodwill [Line Items]
Beginning Balance	124,561
Changes to goodwill	0
Ending Balance	$ 124,561

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- 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

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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

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