Goodwill Assets (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 607,205
Goodwill, Translation Adjustments	(14,820)
Goodwill, Ending Balance	592,385
America's [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	216,385
Goodwill, Translation Adjustments	(11,212)
Goodwill, Ending Balance	205,173
EMEA [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	133,018
Goodwill, Translation Adjustments	(5,557)
Goodwill, Ending Balance	127,461
Asia Pacific [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	141,727
Goodwill, Translation Adjustments	5,113
Goodwill, Ending Balance	146,840
Global Specialty Businesses [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	116,075
Goodwill, Translation Adjustments	(3,164)
Goodwill, Ending Balance	$ 112,911

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_StatementGeographicalAxis=srt_AmericasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=us-gaap_EMEAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=kwr_GlobalSpecialtyBusinessesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: