Fair Value of Financial Instruments - Fair Values and Related Carrying Values of Debt Instruments (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Carrying Amount [Member] | ||
| Long-term Debt | ||
| Long-term Debt | $ 585,000 | $ 585,000 |
| Carrying Amount [Member] | 6.75 % Senior Notes [Member] | ||
| Long-term Debt | ||
| Long-term Debt | 360,000 | 360,000 |
| Carrying Amount [Member] | 7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member] | ||
| Long-term Debt | ||
| Long-term Debt | 225,000 | 225,000 |
| Fair Value [Member] | ||
| Long-term Debt | ||
| Long-term Debt | 512,775 | 417,600 |
| Fair Value [Member] | 6.75 % Senior Notes [Member] | ||
| Long-term Debt | ||
| Long-term Debt | 311,400 | 246,600 |
| Fair Value [Member] | 7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member] | ||
| Long-term Debt | ||
| Long-term Debt | $ 201,375 | $ 171,000 |
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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