Commitment Fee Under Credit Facility Standard

No definition available.

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- Definition

Current ratio of credit facility.

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Issued at Discount, Percent of Par

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Variable Interest Rate, Payable Assessment Period

+ References

No definition available.

+ Details

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- Definition

Equal redemption price percentage of principal amount of debt.

+ References

No definition available.

+ Details

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- Definition

Estimated annual payments, long term debt and other liabilities, due in the next twelve months.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Estimated annual payments, long term debt and other liabilities, due in year five.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Estimated annual payments, long term debt and other liabilities, due in year four.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Estimated annual payments, long term debt and other liabilities, due in year three.

+ References

No definition available.

+ Details

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Namespace Prefix:	unt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Estimated annual payments, long term debt and other liabilities, due in year two.

+ References

No definition available.

+ Details

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Namespace Prefix:	unt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate in addition to LIBOR.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Leverage ratio of long term debt to consolidated EBITDA.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Loan origination fees paid to date. These fees are being amortized over the life of the agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Minimum redemption percentage of debt outstanding.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Outstanding borrowings subject to LIBOR.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Credit facility prohibits the payment of dividends over 0.25 of cni for preceding fiscal year.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage of maximum aggregate principal equity amount of the original principal amount that can be redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	unt_
Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Proceed from equity offerings redemption price percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	unt_
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Balance Type:	na
Period Type:	duration

- Definition

Senior notes repurchase price in percentage for change of control.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Details

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Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

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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-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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

+ Details

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Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) (USD $)	0 Months Ended		12 Months Ended
	Jul. 24, 2012	May 18, 2012	Dec. 31, 2013	Dec. 31, 2012	Nov. 13, 2012	Sep. 05, 2012	May 18, 2011
Debt Instrument [Line Items]
Credit Facility Maximum Credit Amount			$ 900,000,000
Commitment fee under credit facility standard			1.00%
Origination, agency and syndication fees						1,500,000
Debt Instrument, Variable Interest Rate, Payable Assessment Period			90 days
LIBOR interest rate plus one percent			LIBOR plus 1.00%
Credit agreement with an average interest rates of 2.9% at December 31, 2012			0	71,100,000
Current ratio of credit facility			1 to 1
Leverage ratio of long-term debt			4 to 1
Aggregate principal amount					650,000,000		250,000,000
Interest percentage of senior subordinated notes			6.625%		6.625%		6.625%
Debt Instrument, Maturity Date	May 15, 2021	May 15, 2021	May 15, 2021
Proceeds from sale of notes		244,000,000
Deducting fees for debt issuance	8,700,000	6,000,000
Repayment of outstanding borrowings under unsecured credit facility		220,300,000
Debt Instrument, Issued at Discount, Percent of Par	98.75%
Percentage of maximum, aggregate principal equity amount			35.00%
Proceed from equity offerings redemption price percentage			106.625%
Minimum redemption percentage of debt outstanding			65.00%
Equal redemption price percentage of principal amount of debt			100.00%
Senior notes repurchase price in percentage			101.00%
Current Year			12,100,000
Year Two			2,800,000
Year Three			40,400,000
Year Four			4,200,000
Year Five			3,500,000
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage under credit facility			0.375%
LIBOR plus interest rate			1.75%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage under credit facility			0.50%
LIBOR plus interest rate			2.50%
Payments of dividends exceeding percentage			30.00%
Senior Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maturity date			September 13, 2016
Senior Notes, 6.625% Due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	400,000,000
Line Of Credit Facility Commitment Amount [Member]
Debt Instrument [Line Items]
Credit facility current credit amount			500,000,000
Line Of Credit Facility Lender Determined Amount [Member]
Debt Instrument [Line Items]
Credit facility current credit amount			$ 800,000,000