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Long-Term Debt (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 5.10% Senior Notes | Dec. 31, 2012 5.10% Senior Notes | Jan. 20, 2005 5.10% Senior Notes | Dec. 31, 2013 4.50% Senior Notes | Dec. 31, 2012 4.50% Senior Notes | Dec. 10, 2010 4.50% Senior Notes
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Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized discount | $ 36 | $ 70 |  | $ 2,186 | $ 2,500 |
Debt instrument, interest rate | 5.10% | 5.10% | 5.10% | 4.50% | 4.50% | 4.50%

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