Supplemental Guarantor Information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows provided by operating activities	$ 135,449	$ 126,129
Cash flows provided by (used in) investing activities:
Proceeds from intercompany loans	0	0
Kraton purchase of property, plant, and equipment	(71,595)	(62,885)
KFPC purchase of property, plant, and equipment	(11,790)	(16,995)
Purchase of software and other intangibles	(4,959)	(4,691)
Acquisition, net of cash acquired	0	(1,312,105)
Sale of assets	0	72,803
Net cash used in investing activities	(88,344)	(1,323,873)
Cash flows provided by (used in) financing activities:
Proceeds from debt	739,167	1,782,965
Repayments of debt	(837,012)	(480,133)
KFPC proceeds from debt	39,898	24,368
KFPC repayments of debt	(16,244)	0
Capital lease payments	(703)	(105)
Purchase of treasury stock	(2,297)	(967)
Cash contributions from member	0	0
Cash distributions to member	0	0
Proceeds from the exercise of stock options	2,954	2,625
Settlement of interest rate swap	(879)	(5,155)
Settlement of foreign currency hedges	(716)	0
Debt issuance costs	(13,929)	(57,646)
Payments on intercompany loans	0	0
Net cash provided by (used in) financing activities	(89,761)	1,265,952
Effect of exchange rate differences on cash	10,025	5,291
Net increase (decrease) in cash and cash equivalents	(32,631)	73,499
Cash and cash equivalents, beginning of period	121,749	70,049
Cash and cash equivalents, end of period	89,118	143,548
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows provided by operating activities	0	0
Cash flows provided by (used in) investing activities:
Proceeds from intercompany loans	(44,961)	(167,868)
Kraton purchase of property, plant, and equipment	0	0
KFPC purchase of property, plant, and equipment	0	0
Purchase of software and other intangibles	0	0
Acquisition, net of cash acquired		0
Sale of assets		0
Net cash used in investing activities	(44,961)	(167,868)
Cash flows provided by (used in) financing activities:
Proceeds from debt	0	0
Repayments of debt	0	0
KFPC proceeds from debt	0	0
KFPC repayments of debt	0
Capital lease payments	0	0
Purchase of treasury stock	0	0
Cash contributions from member	353,621	967
Cash distributions to member	(353,621)	(967)
Proceeds from the exercise of stock options	0	0
Settlement of interest rate swap	0	0
Settlement of foreign currency hedges	0
Debt issuance costs	0	0
Payments on intercompany loans	44,961	167,868
Net cash provided by (used in) financing activities	44,961	167,868
Effect of exchange rate differences on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Kraton Corporation \| Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows provided by operating activities	0	0
Cash flows provided by (used in) investing activities:
Proceeds from intercompany loans	0	0
Kraton purchase of property, plant, and equipment	0	0
KFPC purchase of property, plant, and equipment	0	0
Purchase of software and other intangibles	0	0
Acquisition, net of cash acquired		0
Sale of assets		0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from debt	0	0
Repayments of debt	0	0
KFPC proceeds from debt	0	0
KFPC repayments of debt	0
Capital lease payments	0	0
Purchase of treasury stock	(2,297)	(967)
Cash contributions from member	0	0
Cash distributions to member	(657)	(1,658)
Proceeds from the exercise of stock options	2,954	2,625
Settlement of interest rate swap	0	0
Settlement of foreign currency hedges	0
Debt issuance costs	0	0
Payments on intercompany loans	0	0
Net cash provided by (used in) financing activities	0	0
Effect of exchange rate differences on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Kraton Polymers LLC \| Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows provided by operating activities	3,202	(53,043)
Cash flows provided by (used in) investing activities:
Proceeds from intercompany loans	44,961	167,868
Kraton purchase of property, plant, and equipment	(2,943)	(2,253)
KFPC purchase of property, plant, and equipment	0	0
Purchase of software and other intangibles	(3,956)	(3,280)
Acquisition, net of cash acquired		(1,367,088)
Sale of assets		0
Net cash used in investing activities	38,062	(1,204,753)
Cash flows provided by (used in) financing activities:
Proceeds from debt	399,350	1,732,890
Repayments of debt	(778,000)	(430,058)
KFPC proceeds from debt	0	0
KFPC repayments of debt	0
Capital lease payments	0	0
Purchase of treasury stock	0	0
Cash contributions from member	(2,297)	(967)
Cash distributions to member	354,278	2,625
Proceeds from the exercise of stock options	0	0
Settlement of interest rate swap	(879)	0
Settlement of foreign currency hedges	(716)
Debt issuance costs	(11,311)	(53,929)
Payments on intercompany loans	0	0
Net cash provided by (used in) financing activities	(39,575)	1,250,561
Effect of exchange rate differences on cash	0	0
Net increase (decrease) in cash and cash equivalents	1,689	(7,235)
Cash and cash equivalents, beginning of period	214	7,256
Cash and cash equivalents, end of period	1,903	21
Guarantor Subsidiaries \| Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows provided by operating activities	83,812	142,718
Cash flows provided by (used in) investing activities:
Proceeds from intercompany loans	0	0
Kraton purchase of property, plant, and equipment	(39,904)	(38,082)
KFPC purchase of property, plant, and equipment	0	0
Purchase of software and other intangibles	(147)	(1,411)
Acquisition, net of cash acquired		11,590
Sale of assets		72,803
Net cash used in investing activities	(40,051)	44,900
Cash flows provided by (used in) financing activities:
Proceeds from debt	32,797	50,075
Repayments of debt	(32,797)	(50,075)
KFPC proceeds from debt	0	0
KFPC repayments of debt	0
Capital lease payments	(703)	(105)
Purchase of treasury stock	0	0
Cash contributions from member	0	0
Cash distributions to member	0	0
Proceeds from the exercise of stock options	0	0
Settlement of interest rate swap	0	(5,155)
Settlement of foreign currency hedges	0
Debt issuance costs	0	(3,717)
Payments on intercompany loans	(44,824)	(168,075)
Net cash provided by (used in) financing activities	(45,527)	(177,052)
Effect of exchange rate differences on cash	0	0
Net increase (decrease) in cash and cash equivalents	(1,766)	10,566
Cash and cash equivalents, beginning of period	6,280	11,595
Cash and cash equivalents, end of period	4,514	22,161
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows provided by operating activities	48,435	36,454
Cash flows provided by (used in) investing activities:
Proceeds from intercompany loans	0	0
Kraton purchase of property, plant, and equipment	(28,748)	(22,550)
KFPC purchase of property, plant, and equipment	(11,790)	(16,995)
Purchase of software and other intangibles	(856)	0
Acquisition, net of cash acquired		43,393
Sale of assets		0
Net cash used in investing activities	(41,394)	3,848
Cash flows provided by (used in) financing activities:
Proceeds from debt	307,020	0
Repayments of debt	(26,215)	0
KFPC proceeds from debt	39,898	24,368
KFPC repayments of debt	(16,244)
Capital lease payments	0	0
Purchase of treasury stock	0	0
Cash contributions from member	(351,324)	0
Cash distributions to member	0	0
Proceeds from the exercise of stock options	0	0
Settlement of interest rate swap	0	0
Settlement of foreign currency hedges	0
Debt issuance costs	(2,618)	0
Payments on intercompany loans	(137)	207
Net cash provided by (used in) financing activities	(49,620)	24,575
Effect of exchange rate differences on cash	10,025	5,291
Net increase (decrease) in cash and cash equivalents	(32,554)	70,168
Cash and cash equivalents, beginning of period	115,255	51,198
Cash and cash equivalents, end of period	$ 82,701	$ 121,366

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Amount of cash distribution paid to unit-holder of limited partnership (LP).

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