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Long-Term Debt - Long-Term Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | --- | ---
9.0% Senior Subordinated Notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 9.00% | 9.00% | 9.00%
Discount associated with notes |  |  | $ 1.1
7.0% Senior Subordinated Notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 7.00% |  | 7.00%
Discount associated with notes | 1.6 |  | 1.7
5.0% Senior Subordinated Notes due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 5.00% |  | 5.00%
Notes Payable to Finance Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Premium associated with notes | 0.4 |  | 0.7
Mortgage Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Discount associated with notes | $ 0.6 |  | $ 0.7
Minimum [Member] | Notes Payable to Finance Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 9.52% |  | 9.52%
Minimum [Member] | Mortgage Loan at Fix Interest Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 3.51% |  | 3.51%
Minimum [Member] | Mortgage Loan at Variable Interest Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 1.25% |  | 1.25%
Maximum [Member] | Notes Payable to Finance Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 10.52% |  | 10.52%
Maximum [Member] | Mortgage Loan at Fix Interest Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 7.03% |  | 7.03%
Maximum [Member] | Mortgage Loan at Variable Interest Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 3.50% |  | 3.50%
Weighted Average [Member] | Notes Payable to Finance Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest on notes | 10.19% |  | 10.19%
2011 Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 2.25% |  | 2.25%

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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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- 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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- 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 + Details
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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 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 2: 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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