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Debt and Financing Arrangements - Summary of Carrying Amount of Debt and Equity Components (Detail) - 2010 Convertible Senior Subordinated Notes [Member] - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Principal amount of notes $ 48,373 $ 97,650
Unamortized discount   (1,831)
Net carrying amount $ 48,373 $ 95,819