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Interest Cost on Convertible Notes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Long-Term Debt And Capital Lease Obligations [Line Items]    
Contractual interest $ 3,038 $ 5,623
Amortization of debt discount 3,073 5,352
Amortization of deferred note issue costs 251 641
Total interest expense $ 6,362 $ 11,616