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Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified

Jun. 30, 2013

Dec. 31, 2012

Debt Instrument

Debt

$ 3,194,660

$ 4,301,083

Less: current maturities of long-term debt

0

0

Long-term debt

3,194,660

4,301,083

Senior credit facility

Debt Instrument

Debt

0

0

9.875% Senior Notes due 2016, net of $8,843 discount at December 31, 2012

Debt Instrument

Debt

0

^[1]

356,657

^[1]

8.0% Senior Notes due 2018

Debt Instrument

Debt

0

750,000

8.75% Senior Notes due 2020, net of $5,575 and $5,873 discount, respectively

Debt Instrument

Debt

444,425

^[2]

444,127

^[2]

7.5% Senior Notes due 2021, including a premium of $4,128 and $4,328, respectively

Debt Instrument

Debt

1,179,128

^[3]

1,179,328

^[3]

8.125% Senior Notes due 2022

Debt Instrument

Debt

750,000

750,000

7.5% Senior Notes due 2023, net of $3,893 and $4,029 discount, respectively

Debt Instrument

Debt

$ 821,107

^[4]

$ 820,971

^[4]

[1]	Carrying value is net of $8,843 discount at December 31, 2012.
[2]	Carrying value is net of $5,575 and $5,873 discount at June 30, 2013 and December 31, 2012, respectively.
[3]	Carrying value includes a premium, applicable to notes issued in August 2012, of $4,128 and $4,328 at June 30, 2013 and December 31, 2012, respectively.
[4]	Carrying value is net of $3,893 and $4,029 discount at June 30, 2013 and December 31, 2012, respectively.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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)

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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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

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-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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 210.5-02.19,20)

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



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+ 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 210.5-02.22)

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



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