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Additional Information with Respect to Non-vested Shares (Detail) (Employee Stock Option, USD $)	12 Months Ended
	Dec. 31, 2014
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate intrinsic value (in thousands)	$ 33,000pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestAggregateIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted-average remaining contractual term	8 years 9 months 7 days
Weighted-average remaining expected term	3 years 9 months 7 days
Weighted-average remaining vesting period	1 year 7 months 17 days
Unrecognized compensation cost	$ 6,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

X

- Definition

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+ References

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- Definition

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- Definition

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- Definition

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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