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Cash Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stockholders Equity Note [Line Items] |  |  |
Cash dividends paid, per share | $ 0.40 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid
Cash dividends paid | $ 58,288 us-gaap_DividendsCommonStockCash | $ 29,112 us-gaap_DividendsCommonStockCash | $ 30,302 us-gaap_DividendsCommonStockCash
Period 1 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Cash dividends paid, date | Mar. 27, 2014 | Mar. 29, 2013 | Mar. 30, 2012
Cash dividends paid, per share | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodOneMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodOneMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodOneMember
Cash dividends paid | 14,456 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodOneMember | 7,312 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodOneMember | 7,788 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodOneMember
Period 2 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Cash dividends paid, date | Jul. 26, 2014 | Jun. 28, 2013 | Jun. 29, 2012
Cash dividends paid, per share | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodTwoMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodTwoMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodTwoMember
Cash dividends paid | 14,562 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodTwoMember | 7,361 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodTwoMember | 7,650 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodTwoMember
Period 3 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Cash dividends paid, date | Sep. 24, 2014 | Sep. 30, 2013 | Sep. 28, 2012
Cash dividends paid, per share | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodThreeMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodThreeMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodThreeMember
Cash dividends paid | 14,634 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodThreeMember | 7,231 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodThreeMember | 7,518 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodThreeMember
Period 4 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Cash dividends paid, date | Dec. 24, 2014 | Dec. 31, 2013 | Dec. 28, 2012
Cash dividends paid, per share | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodFourMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodFourMember | $ 0.05 us-gaap_CommonStockDividendsPerShareCashPaid / pten_PeriodicDividendsPayableAxis = pten_PeriodFourMember
Cash dividends paid | $ 14,636 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodFourMember | $ 7,208 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodFourMember | $ 7,346 us-gaap_DividendsCommonStockCash / pten_PeriodicDividendsPayableAxis = pten_PeriodFourMember

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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