Supplemental Guarantor Information - Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Statement of Income Captions [Line Items]
Net income (loss) attributable to Kraton	$ (4,033)	$ 15,560	$ 27,941	$ 111,048
Other comprehensive income:
Foreign currency translation adjustments, net of tax	18,910	3,994	60,691	27,311
Unrealized gain (loss) on cash flow hedges, net of tax	(239)	(48)	(145)	(5,354)
Reclassification of loss on cash flow hedge	920	0	879	0
Other comprehensive income, net of tax	19,591	3,946	61,425	21,957
Comprehensive income attributable to Kraton	15,558	19,506	89,366	133,005
Comprehensive income (loss) attributable to noncontrolling interest	(787)	339	(3,258)	(199)
Consolidated comprehensive income (loss)	14,771	19,845	86,108	132,806
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income (loss) attributable to Kraton	(12,075)	(36,102)	(100,059)	(230,518)
Other comprehensive income:
Foreign currency translation adjustments, net of tax	0	0	0	0
Unrealized gain (loss) on cash flow hedges, net of tax	0	0	0	0
Reclassification of loss on cash flow hedge	0		0
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income attributable to Kraton	(12,075)	(36,102)	(100,059)	(230,518)
Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Consolidated comprehensive income (loss)	(12,075)	(36,102)	(100,059)	(230,518)
Kraton Corporation | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss) attributable to Kraton	(4,851)	14,843	22,763	109,256
Other comprehensive income:
Foreign currency translation adjustments, net of tax	0	0	0	0
Unrealized gain (loss) on cash flow hedges, net of tax	0	0	0	0
Reclassification of loss on cash flow hedge	0		0
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income attributable to Kraton	(4,851)	14,843	22,763	109,256
Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Consolidated comprehensive income (loss)	(4,851)	14,843	22,763	109,256
Kraton Polymers LLC | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss) attributable to Kraton	(4,851)	14,843	22,763	109,256
Other comprehensive income:
Foreign currency translation adjustments, net of tax	0	0	0	0
Unrealized gain (loss) on cash flow hedges, net of tax	(239)	(21)	(145)	(5,293)
Reclassification of loss on cash flow hedge	920		879
Other comprehensive income, net of tax	681	(21)	734	(5,293)
Comprehensive income attributable to Kraton	(4,170)	14,822	23,497	103,963
Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Consolidated comprehensive income (loss)	(4,170)	14,822	23,497	103,963
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss) attributable to Kraton	17,131	29,564	35,115	86,695
Other comprehensive income:
Foreign currency translation adjustments, net of tax	0	0	0	0
Unrealized gain (loss) on cash flow hedges, net of tax	0	0	0	0
Reclassification of loss on cash flow hedge	0		0
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income attributable to Kraton	17,131	29,564	35,115	86,695
Comprehensive income (loss) attributable to noncontrolling interest	0	0	0	0
Consolidated comprehensive income (loss)	17,131	29,564	35,115	86,695
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Statement of Income Captions [Line Items]
Net income (loss) attributable to Kraton	613	(7,588)	47,359	36,359
Other comprehensive income:
Foreign currency translation adjustments, net of tax	18,910	3,994	60,691	27,311
Unrealized gain (loss) on cash flow hedges, net of tax	0	(27)	0	(61)
Reclassification of loss on cash flow hedge	0		0
Other comprehensive income, net of tax	18,910	3,967	60,691	27,250
Comprehensive income attributable to Kraton	19,523	(3,621)	108,050	63,609
Comprehensive income (loss) attributable to noncontrolling interest	(787)	339	(3,258)	(199)
Consolidated comprehensive income (loss)	$ 18,736	$ (3,282)	$ 104,792	$ 63,410