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Components of Convertible Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Apr. 30, 2009 | Apr. 06, 2009
Debt Instrument |  |  |  |
Debt principal | $ 190,000 | $ 190,000 | $ 190,000 | $ 190,000
Unamortized discount | 20,104 | 33,902 |  |
Net carrying amount of the convertible debt | 169,896 | 156,098 |  |
Contractual interest expense on the coupon | 8,550 | 8,550 |  |
Amortization of the discount component and debt issue fees recognized as interest expense | 14,612 | 12,853 |  |
Total interest expense on the convertible debt | $ 23,162 | $ 21,403 |  |

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