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Details of 1.875% Convertible Notes Reflected on Unaudited Condensed Consolidated Balance Sheet (Detail) (1.875% Convertible Notes, USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
1.875% Convertible Notes
Debt Instrument [Line Items]
Equity component carrying amount	$ 41,309	$ 41,309
Unamortized discount	17,091	24,784
Net debt carrying amount	$ 270,409	$ 262,716

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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