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v2.4.1.9

Company's Demand Deposits and Temporary Cash Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Risks And Uncertainties [Abstract] |  |  |  |
Deposits in FDIC and SIPC-insured institutions under insurance limits | $ 636 pten_DepositsInInsuredInstitutionsUnderInsuranceLimits | $ 369 pten_DepositsInInsuredInstitutionsUnderInsuranceLimits |  |
Deposits in FDIC and SIPC-insured institutions over insurance limits | 1,420 pten_DepositsInInsuredInstitutionsOverInsuranceLimits | 269,314 pten_DepositsInInsuredInstitutionsOverInsuranceLimits |  |
Deposits in foreign banks | 43,664 pten_DepositsForeignBanks | 20,921 pten_DepositsForeignBanks |  |
Total Cash and cash equivalents., Total | 45,720 pten_CashCashEquivalents | 290,604 pten_CashCashEquivalents |  |
Less outstanding checks and other reconciling items | (2,708)pten_BankChecksOutstandingAndOtherReconcilingItems | (41,095)pten_BankChecksOutstandingAndOtherReconcilingItems |  |
Cash and cash equivalents | $ 43,012 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 249,509 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 110,723 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 23,946 us-gaap_CashAndCashEquivalentsAtCarryingValue

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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