XML 96 R107.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Fair Values of Financial Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 15, 2019	Jan. 19, 2018	Jun. 14, 2012	Oct. 05, 2010
3.95% Senior Notes Due 2028
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt interest rate	3.95%	3.95%		3.95%
Current market rates used in measuring fair value	4.33%	5.07%
5.15% Senior Notes Due 2029
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt interest rate	5.15%		5.15%
Current market rates used in measuring fair value	4.81%
4.97% Series A Senior Notes, Due October 5th 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt interest rate						4.97%
Current market rates used in measuring fair value		4.97%
4.27% Series B Senior Notes, Due June 14th 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt interest rate					4.27%
Current market rates used in measuring fair value		4.92%

X

- Definition

Minimum percentage of fair value transactions corroborated using observable market inputs required for level two.

+ References

No definition available.

+ Details

Name:	pten_MinimumPercentageOfFairValueTransactionsCorroboratedUsingObservableMarketInputsRequiredForLevelTwo
Namespace Prefix:	pten_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=pten_ThreePointNineFivePercentSeniorNotesDueJanuaryTwoThousandTwentyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=pten_FivePointOneFivePercentSeniorNotesDueNovemberTwoThousandTwentyNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=pten_SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=pten_SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: