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Components of Long Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Mar. 31, 2015
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding $ 287,162 $ 323,548  
Less: unamortized discount and fees (6,852) (11,052)  
Less: current portion (2,457) (37,611)  
LONG-TERM DEBT 277,853 274,885  
Other debt      
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding 893 1,149  
Term loan credit agreement      
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding 190,434 191,399 $ 192,800
Convertible Senior Notes      
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding $ 95,835 $ 131,000