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Components of Long Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Feb. 29, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding $ 287,773 $ 12,017,000 $ 323,548
Less: unamortized discount and fees (7,632)   (11,052)
Less: current portion (2,451)   (37,611)
LONG-TERM DEBT 277,690   274,885
Term loan credit agreement      
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding 190,917   191,399
Industrial revenue bond      
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding 1,021   1,149
Convertible Senior Notes      
Debt Instrument [Line Items]      
Principal amount of convertible notes outstanding $ 95,835   $ 131,000