XML 67 R55.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Long Term Debt - Senior Notes - Additional Information (Detail) |  |  | 3 Months Ended
--- | --- | --- | ---
Jun. 14, 2012 USD ($) Covenant | Oct. 05, 2010 USD ($) Covenant | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Interest expense related to amortization of debt issuance costs |  |  | $ 745,000 | $ 547,000
4.97% Series A Senior Notes, Due October 5th 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt maturity date |  | Oct. 05, 2020 |  |
Long-term debt, aggregate principal amount |  | $ 300,000,000 |  |
Debt interest rate |  | 4.97% |  |
Semi-annual interest payment, first payment date |  |  | April 5 |
Semi-annual interest payment, second payment date |  |  | October 5 |
Notes issuance date |  | Oct. 05, 2010 |  |
Description of the prepayment terms |  |  | Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date. |
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium |  | 100.00% |  |
Description of the acceptance terms |  |  | If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date. |
Acceptance terms, percent of principal before accrued and unpaid interest |  | 100.00% |  |
Note purchase agreement, financial covenant description |  |  | The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at March 31, 2016. |
Number of compliance covenants | Covenant |  | 2 |  |
4.97% Series A Senior Notes, Due October 5th 2020 | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, prepayment percentage of aggregate principal amount |  | 5.00% |  |
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter |  | 2.50% |  |
4.97% Series A Senior Notes, Due October 5th 2020 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt to capitalization ratio, percentage the Company must not exceed at any time |  | 50.00% |  |
4.27% Series B Senior Notes, Due June 14th 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt maturity date | Jun. 14, 2022 |  |  |
Long-term debt, aggregate principal amount | $ 300,000,000 |  |  |
Debt interest rate | 4.27% |  |  |
Semi-annual interest payment, first payment date |  |  | April 5 |
Semi-annual interest payment, second payment date |  |  | October 5 |
Notes issuance date | Jun. 14, 2012 |  |  |
Description of the prepayment terms |  |  | Notes are prepayable at the Company’s option, in whole or in part, provided that in the case of a partial prepayment, prepayment must be in an amount not less than 5% of the aggregate principal amount of the notes then outstanding, at any time and from time to time at 100% of the principal amount prepaid, plus accrued and unpaid interest to the prepayment date, plus a “make-whole” premium as specified in the note purchase agreements. The Company must offer to prepay the notes upon the occurrence of any change of control. In addition, the Company must offer to prepay the notes upon the occurrence of certain asset dispositions if the proceeds therefrom are not timely reinvested in productive assets. If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date. |
Prepayment terms, percent of principal before accrued and unpaid interest and "make-whole" premium | 100.00% |  |  |
Description of the acceptance terms |  |  | If any offer to prepay is accepted, the purchase price of each prepaid note is 100% of the principal amount thereof, plus accrued and unpaid interest thereon to the prepayment date. |
Acceptance terms, percent of principal before accrued and unpaid interest | 100.00% |  |  |
Note purchase agreement, financial covenant description |  |  | The Company must not permit its debt to capitalization ratio to exceed 50% at any time. The note purchase agreements generally define the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 2.50 to 1.00. The note purchase agreements generally define the interest coverage ratio as the ratio of EBITDA for the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at March 31, 2016. |
Number of compliance covenants | Covenant | 2 |  |  |
4.27% Series B Senior Notes, Due June 14th 2022 | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, prepayment percentage of aggregate principal amount | 5.00% |  |  |
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter | 2.50% |  |  |
4.27% Series B Senior Notes, Due June 14th 2022 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt to capitalization ratio, percentage the Company must not exceed at any time | 50.00% |  |  |

X
- Definition Consolidated debt as percentage of capitalization. + References No definition available. + Details
Name: | pten_ConsolidatedDebtAsPercentageOfCapitalization
Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument acceptance terms. + References No definition available. + Details
Name: | pten_DebtInstrumentAcceptanceTerms
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument prepayment percentage of aggregate principal amount. + References No definition available. + Details
Name: | pten_DebtInstrumentPrepaymentPercentageOfAggregatePrincipalAmount
Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument prepayment terms. + References No definition available. + Details
Name: | pten_DebtInstrumentPrepaymentTerms
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument semi annual payment date one. + References No definition available. + Details
Name: | pten_DebtInstrumentSemiAnnualPaymentDateOne
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument semi annual payment date two. + References No definition available. + Details
Name: | pten_DebtInstrumentSemiAnnualPaymentDateTwo
Namespace Prefix: | pten_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest coverage ratio. + References No definition available. + Details
Name: | pten_InterestCoverageRatio
Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of covenants. + References No definition available. + Details
Name: | pten_NumberOfCovenants
Namespace Prefix: | pten_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of repurchase price to principal debt amount. + References No definition available. + Details
Name: | pten_PercentageOfRepurchasePriceToPrincipalDebtAmount
Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
Name: | us-gaap_AmortizationOfFinancingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentCovenantDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentIssuanceDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
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: |