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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

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