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Components of Long Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt, Total $ 558,120 $ 239,097
Less: unamortized discount and fees (7,419) (3,164)
Less: current portion (46,081) (2,468)
LONG-TERM DEBT 504,620 233,465
Convertible senior notes due 2018    
Debt Instrument [Line Items]    
Long-term Debt, Total 44,841 48,951
Senior notes due 2025    
Debt Instrument [Line Items]    
Long-term Debt, Total 325,000 0
Other debt    
Debt Instrument [Line Items]    
Long-term Debt, Total 230 676
Term loan credit agreement    
Debt Instrument [Line Items]    
Long-term Debt, Total $ 188,049 $ 189,470