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Debt - Additional Information (Detail)
$ in Millions
3 Months Ended
Apr. 13, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 15, 2016
USD ($)
shares
Debt Instrument [Line Items]      
Payment of capped call transactions   $ 24.3  
Notes      
Debt Instrument [Line Items]      
Payment of capped call transactions     $ 24.3
Debt discount     30.0
Notes | Subsequent Event      
Debt Instrument [Line Items]      
Convertible senior notes, principal amount $ 23.5    
Payment of capped call transactions $ 3.0    
Notes | Convertible Senior Notes | Due 2021      
Debt Instrument [Line Items]      
Convertible senior notes, principal amount     $ 190.0
Convertible senior notes interest rate     5.50%
Conversion rate for the notes     0.1024249
Convertible shares total | shares     19,460,731