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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail) | Jun. 30, 2013 | Dec. 31, 2012
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7.25% Senior Subordinated notes due 2018 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Interest rate on senior subordinated notes | 7.25% | 7.25%
8.00% Senior Subordinated notes due 2019 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Interest rate on senior subordinated notes | 8.00% | 8.00%
6.75% Senior Subordinated notes due 2020 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Interest rate on senior subordinated notes | 6.75% | 6.75%
5.75% Senior Subordinated Notes due 2021 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Interest rate on senior subordinated notes | 5.75% | 5.75%
5.00% Senior Subordinated notes due 2022 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Interest rate on senior subordinated notes | 5.00% | 5.00%
5.00% senior subordinated notes due 2023 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Interest rate on senior subordinated notes | 5.00% | 5.00%

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- Definition Interest rate stated in the contractual 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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