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Interest Expense (Detail) (5.375% Convertible notes, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
5.375% Convertible notes
   
Debt Instrument [Line Items]    
Contractual coupon interest $ 1,549 $ 1,142
Accretion of debt discount 2,304 1,425
Amortization of debt issuance costs 148 120
Interest Expense, Debt, Total $ 4,001 $ 2,687