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Cash Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 27, 2014 | Mar. 25, 2015
Stockholders Equity Note [Line Items] |  |  |  |
Cash dividends paid, per share | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Cash dividends paid | $ 14,640 us-gaap_DividendsCommonStockCash |  |  |
Installment 1, FY 2014 |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Cash dividends paid, date |  | Mar. 27, 2014 |  |
Cash dividends paid, per share |  |  | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = pten_InstallmentOneFiscalYearTwoThousandFourteenMember |
Installment 1, FY 2015 |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Cash dividends paid, date | Mar. 25, 2015 |  |  |
Cash dividends paid, per share |  |  |  | $ 0.10 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = pten_InstallmentOneFiscalYearTwoThousandFifteenMember
Retained Earnings |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Cash dividends paid | $ 14,640 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 14,456 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |

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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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