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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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X

- Definition

Percentage of acquisition in merger or other unapproved party description.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of beneficial ownership not exercisable prior to adoption of Right agreement, Description.

+ References

No definition available.

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X

- Definition

percentage of beneficial ownership required to exercise the right under Rights agreement description.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of discount on purchase of additional share in Right agreement.

+ References

No definition available.

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X

- Definition

Percentage of discount on share acquisition in merger or other unapproved party.

+ References

No definition available.

+ Details

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X

- Definition

Preferred stock exercise price per right.

+ References

No definition available.

+ Details

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Namespace Prefix:	pten_
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Balance Type:	na
Period Type:	instant

X

- Definition

Redemption price of rights.

+ References

No definition available.

+ Details

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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

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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.

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- Details

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