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v2.4.0.8

Long-Term Debt (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
5.10% Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 53 | $ 70
Debt instrument, interest rate | 5.10% | 5.10%
4.50% Senior Notes |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 2,343 | $ 2,500
Debt instrument, interest rate | 4.50% | 4.50%

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