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Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Contract Drilling	Dec. 31, 2013 Contract Drilling	Sep. 30, 2014 Pressure Pumping
Goodwill [Line Items]
Beginning Balance	$ 153,809	$ 86,234	$ 86,234	$ 67,575
Changes to goodwill	15,485			15,485
Ending Balance	$ 169,294	$ 86,234	$ 86,234	$ 83,060

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://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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- Details

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X

- 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://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

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