Earnings Per Share - Diluted (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 12,551	$ 10,925	$ 42,253	$ 34,398
Less: Income Allocated to Participating Securities	(109)	(102)	(357)	(401)
Net Income Available to Common Shareholders	$ 12,442	$ 10,823	$ 41,896	$ 33,997
Basic Weighted Average Common Shares Outstanding	13,062,417	12,937,417	13,034,289	12,840,029
Effect of Dilutive Securities	22,488	33,892	25,909	70,265
Diluted Weighted Average Common Shares Outstanding	13,084,905	12,971,309	13,060,198	12,910,294
Diluted Earnings per Common Share	$ 0.95	$ 0.83	$ 3.21	$ 2.63