Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 136,276us-gaap_NetIncomeLoss	$ 184,746us-gaap_NetIncomeLoss	$ 23,176us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation, depletion, and amortization	404,943	333,907	319,021
Impairment of properties (Note 2)	158,069unt_Impairmentofproperties	0unt_Impairmentofproperties	283,606unt_Impairmentofproperties
(Gain) loss on derivatives	(30,147)us-gaap_UnrealizedGainLossOnDerivatives	7,771us-gaap_UnrealizedGainLossOnDerivatives	(50,610)us-gaap_UnrealizedGainLossOnDerivatives
Cash (payments) receipts on derivatives settled	(6,038)us-gaap_DerivativeCashReceivedOnHedge	(1,161)us-gaap_DerivativeCashReceivedOnHedge	51,853us-gaap_DerivativeCashReceivedOnHedge
Gain on disposition of assets	(8,953)us-gaap_GainsLossesOnSalesOfAssets	(17,076)us-gaap_GainsLossesOnSalesOfAssets	(253)us-gaap_GainsLossesOnSalesOfAssets
Deferred tax expense	77,285us-gaap_DeferredIncomeTaxExpenseBenefit	100,732us-gaap_DeferredIncomeTaxExpenseBenefit	15,530us-gaap_DeferredIncomeTaxExpenseBenefit
Employee stock compensation plans	24,320us-gaap_ShareBasedCompensation	21,317us-gaap_ShareBasedCompensation	16,956us-gaap_ShareBasedCompensation
Bad debt expense	3,562us-gaap_ProvisionForOtherLosses	0us-gaap_ProvisionForOtherLosses	90us-gaap_ProvisionForOtherLosses
ARO liability accretion	4,599us-gaap_AccretionExpense	5,450us-gaap_AccretionExpense	4,615us-gaap_AccretionExpense
Other, net	1,068us-gaap_OtherNoncashIncomeExpense	2,250us-gaap_OtherNoncashIncomeExpense	781us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	(60,800)	2,967	13,994
Materials and supplies	2,602us-gaap_IncreaseDecreaseInInventories	(2,435)us-gaap_IncreaseDecreaseInInventories	(361)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(444)	1,813	(3,466)
Accounts payable	4,715	15,715	10,187
Accrued liabilities	(1,297)	17,198	6,911
Contract advances	(767)	1,137	(1,119)
Net cash provided by operating activities	708,993	674,331	690,911
INVESTING ACTIVITIES:
Capital expeditures	(981,374)	(703,984)	(762,381)
Producing property and other acquisitions	(5,723)	0	(598,485)
Proceeds from disposition of property and equipment	66,197	120,910	281,824
Other	303	3,894	0
Net cash used in investing activities	(920,597)	(579,180)	(1,079,042)
FINANCING ACTIVITIES:
Borrowings under line of credit	725,800us-gaap_ProceedsFromLinesOfCredit	222,500us-gaap_ProceedsFromLinesOfCredit	735,300us-gaap_ProceedsFromLinesOfCredit
Payments under line of credit	(559,800)us-gaap_RepaymentsOfLinesOfCredit	(293,600)us-gaap_RepaymentsOfLinesOfCredit	(714,200)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from issuance of senior subordinated notes, net of debt issuance costs and discount	0	0	386,274
Payments on capitalized leases	(2,392)	0	0
Proceeds from exercise of stock options	1,083	574	215
Tax benefit from stock options	1,614	8	121
Increase (decrease) in book overdrafts (Note 2)	27,755	(7,014)	(19,440)
Net cash provided by (used in) financing activities	194,060	(77,532)	388,270
Net increase (decrease) in cash and cash equivalents	(17,544)	17,619	139
Cash and cash equivalents, beginning of year	18,593	974	835
Cash and cash equivalents, end of year	1,049	18,593	974
Supplemental disclosure of cash flow information:
Interest paid (net of capitalization)	13,620us-gaap_InterestPaidNet	12,485us-gaap_InterestPaidNet	14,880us-gaap_InterestPaidNet
Income taxes	15,898us-gaap_IncomeTaxesPaidNet	9,100us-gaap_IncomeTaxesPaidNet	5,116us-gaap_IncomeTaxesPaidNet
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	(31,968)	(6,550)	(4,753)
Non-cash (additions) reductions to oil and natural gas properties related to asset retirement obligations	37,689	17,952	(45,097)
Non-cash additions to property, plant, and equipment acquired under capital leases	$ (28,202)	$ 0	$ 0

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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-Section 08

-Paragraph f

-Article 4

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-Publisher FASB

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-Glossary Financing Activities

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The net cash inflow or outflow from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Amount of expense related to other loss.

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(f))

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-Publisher FASB

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-Glossary Financing Activities

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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Amount of asset retirement obligations settled through noncash transactions. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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