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Financing Arrangements - Schedule of Notes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Convertible Senior Notes [Line Items]      
Net carrying amount $ 419,426 $ 356,602  
Convertible Debt      
Convertible Senior Notes [Line Items]      
Proceeds 250,000 250,000 $ 250,000
Less: debt discount, net of amortization (31,824) (37,148)  
Net carrying amount 218,176 212,852  
Equity component $ 39,287 $ 39,287