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Components of Long Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt $ 547,436 $ 557,233
Less: unamortized discount and fees (6,505) (7,122)
Less: current portion (37,106) (46,020)
LONG-TERM DEBT 503,825 504,091
Convertible senior notes due 2018 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 35,328 44,561
Senior notes due 2025 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 325,000 325,000
Other debt    
Debt Instrument [Line Items]    
Long-term Debt 0 93
Term loan credit agreement    
Debt Instrument [Line Items]    
Long-term Debt $ 187,108 $ 187,579