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v3.20.1

Subsequent Events - Additional Information (Detail) - $ / shares | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Apr. 22, 2020 | Dec. 31, 2019
Subsequent Event [Line Items] |  |  |
Preferred stock, par value | $ 0.01 |  | $ 0.01
Percentage of beneficial ownership required to exercise the right under Rights agreement, Description | 10% (12% for passive investors) or more |  |
Percentage of discount on purchase of additional share in Right agreement |  | 50.00% |
Percentage of acquisition in merger or other unapproved party description | more than 10% (12% for passive investors) |  |
Percentage of discount on share acquisition in merger or other unapproved party |  | 50.00% |
Redemption price of rights |  | $ 0.001 |
Percentage of beneficial ownership not exercisable prior to adoption of Right agreement, Description | 10% (12% for passive investors) or more |  |
Expire period of Right agreement | Apr. 21, 2021 |  |
Subsequent Event | Series A Junior Participating Preferred Stock |  |  |
Subsequent Event [Line Items] |  |  |
Preferred stock, par value |  | 0.01 |
Preferred stock, exercise price per right |  | $ 17.00 |

X
- Definition Expire period of Right agreement. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Percentage of acquisition in merger or other unapproved party description. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of beneficial ownership not exercisable prior to adoption of Right agreement, Description. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition percentage of beneficial ownership required to exercise the right under Rights agreement description. + References No definition available. + Details
Name: | pten_PercentageOfBeneficialOwnershipRequiredToExerciseRightUnderRightsAgreementDescription
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Percentage of discount on purchase of additional share in Right agreement. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | num:percentItemType
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Period Type: | instant

X
- Definition Percentage of discount on share acquisition in merger or other unapproved party. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred stock exercise price per right. + References No definition available. + Details
Name: | pten_PreferredStockExercisePricePerRight
Namespace Prefix: | pten_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Redemption price of rights. + References No definition available. + Details
Name: | pten_RedemptionPriceOfRights
Namespace Prefix: | pten_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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