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Components of Long Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt $ 511,639 $ 557,233
Less: unamortized discount and fees (6,183) (7,122)
Less: current portion (1,880) (46,020)
LONG-TERM DEBT 503,576 504,091
Convertible senior notes due 2018 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 0 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 $ 186,639 $ 187,579