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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
Risks And Uncertainties [Abstract]
Deposits in FDIC and SIPC-insured institutions under insurance limits	$ 636	$ 369
Deposits in FDIC and SIPC-insured institutions over insurance limits	1,420	269,314
Deposits in foreign banks	43,664pten_DepositsForeignBanks	20,921pten_DepositsForeignBanks
Total Cash and cash equivalents., Total	45,720pten_CashCashEquivalents	290,604pten_CashCashEquivalents
Less outstanding checks and other reconciling items	(2,708)	(41,095)
Cash and cash equivalents	$ 43,012	$ 249,509	$ 110,723	$ 23,946

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.

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