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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Feb. 04, 2015 | Dec. 31, 2014 | Aug. 01, 2007 | Jul. 25, 2012 | Sep. 06, 2013
Stockholders Equity Note [Line Items] |  |  |  |  |
Remaining Amount approved for repurchases under stock buyback program |  | $ 187 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
2007 Program | Maximum |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount approved for repurchases under stock buyback program |  |  | 250 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanMember |  |
2012 Program | Maximum |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount approved for repurchases under stock buyback program |  |  |  | 150 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanOneMember |
2013 Program | Maximum |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount approved for repurchases under stock buyback program |  |  |  |  | $ 200 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanTwoMember
Subsequent Event | Dividend Declared |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Dividend declaration date | Feb. 04, 2015 |  |  |  |
Dividend per share, declared | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Dividend payment date | Mar. 25, 2015 |  |  |  |
Dividend record date | Mar. 11, 2015 |  |  |  |

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- Definition Aggregate dividends declared 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 Date the dividend to be paid was declared, 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 Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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