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Details of 2.50% Convertible Notes Reflected on Unaudited Condensed Consolidated Balance Sheet (Detail) (2.50% Convertible Notes, USD $)
In Thousands
Jun. 30, 2011
2.50% Convertible Notes
 
Debt Instrument [Line Items]  
Equity component carrying amount $ 33,875
Unamortized discount 62,479
Net debt carrying amount $ 237,521