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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 |
Jun. 30, 2014
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Dec. 31, 2013
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|---|---|---|
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Carrying Amount [Member]
|
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| Long-term Debt | ||
| Long term debt Fair value | $ 585,000 | $ 650,000 |
|
Carrying Amount [Member] | 6.75% Senior Notes, due July 2022 [Member]
|
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| Long-term Debt | ||
| Long term debt Fair value | 360,000 | 0 |
|
Carrying Amount [Member] | 7.50% Senior Notes, due August 2020 [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | 225,000 | 225,000 |
|
Carrying Amount [Member] | 9.125% Senior Notes, due April 2018 [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | 0 | 425,000 |
|
Fair Value [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | 617,400 | 682,500 |
|
Fair Value [Member] | 6.75% Senior Notes, due July 2022 [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | 374,400 | 0 |
|
Fair Value [Member] | 7.50% Senior Notes, due August 2020 [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | 243,000 | 236,250 |
|
Fair Value [Member] | 9.125% Senior Notes, due April 2018 [Member]
|
||
| Long-term Debt | ||
| Long term debt Fair value | $ 0 | $ 446,250 |