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v3.20.2

Subsequent Events - Additional Information (Detail) - Subsequent Event | Jul. 22, 2020
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Subsequent Event [Line Items] |
Rights agreement outstanding common stock acquisition percentage description | 20% or more
Rights agreement common stock holding percentage description | 4.9% or more

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- Definition Rights agreement common stock holding percentage description. + References No definition available. + Details
Name: | pten_RightsAgreementCommonStockHoldingPercentageDescription
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rights agreement outstanding common stock acquisition percentage description. + References No definition available. + Details
Name: | pten_RightsAgreementOutstandingCommonStockAcquisitionPercentageDescription
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |