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Long-Term Debt (Parenthetical) (Detail) (USD $) | Jun. 30, 2013 9.875% Senior Notes due 2016 | Dec. 31, 2012 9.875% Senior Notes due 2016 | Jun. 30, 2013 8.0% Senior Notes due 2018 | Dec. 31, 2012 8.0% Senior Notes due 2018 | Jun. 30, 2013 8.75% Senior Notes due 2020 | Dec. 31, 2012 8.75% Senior Notes due 2020 | Jun. 30, 2013 7.5% Senior Notes due 2021 | Dec. 31, 2012 7.5% Senior Notes due 2021 | Jun. 30, 2013 8.125% Senior Notes due 2022 | Dec. 31, 2012 8.125% Senior Notes due 2022 | Jun. 30, 2013 7.5% Senior Notes due 2023 | Dec. 31, 2012 7.5% Senior Notes due 2023 | Jun. 30, 2013 Senior credit facility | Mar. 31, 2013 Senior credit facility | Aug. 31, 2012 Senior credit facility
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Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate | 9.875% | 9.875% | 8.00% | 8.00% | 8.75% | 8.75% | 7.50% | 7.50% | 8.125% | 8.125% | 7.50% | 7.50% |  |  |
Debt maturity date | 2016 | 2016 | 2018 | 2018 | 2020 | 2020 | 2021 | 2021 | 2022 | 2022 | 2023 | 2023 | March 2017 |  |
Long term debt, discount | $ 0 | $ 8,843,000 |  |  | $ 5,575,000 | $ 5,873,000 |  |  |  |  | $ 3,893,000 | $ 4,029,000 |  |  |
Long term debt, premium |  |  |  |  |  |  | 4,128,000 | 4,328,000 |  |  |  |  |  |  |
Line of credit facility maximum borrowings capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 775,000,000 | $ 775,000,000 | $ 775,000,000

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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