Earnings Per Share - Diluted (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 16,083	$ 11,108	$ 29,702	$ 23,473
Less: Income Allocated to Participating Securities	(138)	(106)	(248)	(301)
Net Income Available to Common Shareholders	$ 15,945	$ 11,002	$ 29,454	$ 23,172
Basic Weighted Average Common Shares Outstanding	13,037,822	12,850,917	13,019,991	12,790,799
Effect of Dilutive Securities	24,918	80,913	27,314	88,838
Diluted Weighted Average Common Shares Outstanding	13,062,740	12,931,830	13,047,305	12,879,637
Diluted Earnings per Common Share	$ 1.22	$ 0.85	$ 2.26	$ 1.80