General - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014 Facility
Schedule Of Description Of Business Basis Of Presentation And Significant Accounting Policies [Line Items]
Number of manufacturing facilities	5
Kraton Formosa Polymers Corporation
Schedule Of Description Of Business Basis Of Presentation And Significant Accounting Policies [Line Items]
Percentage of investment in joint venture	50.00%
Styrenic Block Copolymer Joint Venture
Schedule Of Description Of Business Basis Of Presentation And Significant Accounting Policies [Line Items]
Percentage of investment in joint venture	50.00%