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Indebtedness - Debt Outstanding (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Bank debt percentage | 1.80% |  | 1.80% |
7.25% Senior Subordinated notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior subordinated notes | 7.25% | [1] | 7.25% | [1]
8.00% Senior Subordinated notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior subordinated notes | 8.00% | [1] | 8.00% | [1]
Discount on Senior Subordinated notes | $ 9,484 |  | $ 10,815 |
6.75% Senior Subordinated notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior subordinated notes | 6.75% | [1] | 6.75% | [1]
5.75% Senior Subordinated notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior subordinated notes | 5.75% |  | 5.75% |
5.00% Senior Subordinated notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on senior subordinated notes | 5.00% | [1] | 5.00% | [1]
5.00% Senior Subordinated notes due 2023 |  |  |  |
Debt Instrument [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 The effective interest rate at the end of the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 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 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 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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