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Fair Value - Quantitative Disclusure (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Fair Value Inputs Liabilities Quantitative Information [Line Items]        
Business Acquisition Contingent Consideration Actual Cash Payment $ 4,709kwr_BusinessAcquisitionContingentConsiderationActualCashPayment $ 0kwr_BusinessAcquisitionContingentConsiderationActualCashPayment $ 0kwr_BusinessAcquisitionContingentConsiderationActualCashPayment  
Summit Earnout [Member]        
Fair Value Inputs Liabilities Quantitative Information [Line Items]        
Business Acquisition Contingent Consideration Actual Cash Payment       $ 4,709kwr_BusinessAcquisitionContingentConsiderationActualCashPayment
/ us-gaap_FairValueByLiabilityClassAxis
= kwr_SummitEarnoutMember