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Investments in Associated Companies - Summarized Financial Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Manufacturing And Services [Member]      
Equity Method Investment Summarized Financial Information Abstract      
Current Assets $ 27,679us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
$ 28,363us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
 
Non-current Assets 1,105us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
717us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
 
Current Liabilities 13,648us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
13,974us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
 
Non-current Liabilities 397us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
501us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
 
Equity Method Investment Summarized Financial Information Income Statement [Abstract]      
Revenue 48,834us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
47,226us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
55,963us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
Gross Profit 15,698us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
16,096us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
18,480us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
Income Before Income Taxes 3,546kwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
3,687kwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
3,170kwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
Net Income 2,263us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
2,142us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
2,118us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ProductOrServiceAxis
= kwr_ManufacturingAndServicesMember
Captive Insurance Company [Member]      
Equity Method Investment Summarized Financial Information Abstract      
Total Assets 109,259us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
106,450us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
 
Total Liabilities 59,773us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
63,938us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
 
Equity Method Investment Summarized Financial Information Income Statement [Abstract]      
Revenue 10,755us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
20,895us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
8,473us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
Income Before Income Taxes 10,929kwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
25,625kwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
8,901kwr_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeIncomeTaxes
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
Net Income $ 7,352us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
$ 16,876us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember
$ 6,031us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ProductOrServiceAxis
= kwr_CaptiveInsuranceCompanyMember