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Schedule of Long-Term Debt (Parenthetical) (Detail)
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Jun. 30, 2013
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Dec. 31, 2012
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| Debt Instrument [Line Items] | ||
| Senior notes interest rate | 8.50% | 8.50% |
| X | ||||||||||
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- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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