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Fair Value of Financial Instruments - Fair Values and Related Carrying Values of Debt Instruments (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|
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Carrying Amount [Member]
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| Long-term Debt | ||
| Long term debt Fair value | $ 425,000 | $ 425,000 |
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Carrying Amount [Member] | 9.125% Senior Notes, due April 2018 [Member]
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| Long-term Debt | ||
| Long term debt Fair value | 425,000 | 425,000 |
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Fair Value [Member]
|
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| Long-term Debt | ||
| Long term debt Fair value | 463,250 | 453,688 |
|
Fair Value [Member] | 9.125% Senior Notes, due April 2018 [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | $ 463,250 | $ 453,688 |