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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail) | Dec. 31, 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% | [1] | 7.25% | [1]
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% | [1] | 8.00% | [1]
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% | [1] | 6.75% | [1]
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% | [1] | 5.75% | [1]
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% | [1] | 5.00% | [1]
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% | [1] | 5.00% | [1]
[1] | The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes, which are Level 2 inputs.

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- 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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