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Fair Value Measurement (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Goodwill, Impairment Loss, before tax $ 4.0dysl_GoodwillImpairmentLossBeforeTax
Acquired Customer Base [Member]  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Goodwill, Impairment Loss, before tax 2.8dysl_GoodwillImpairmentLossBeforeTax
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= dysl_AcquiredCustomerBaseMember
Goodwill Acquired Loss Before Tax 4.8dysl_GoodwillAcquiredLossBeforeTax
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= dysl_AcquiredCustomerBaseMember
Fair Value, Inputs, Level 3 [Member] | Acquired Customer Base [Member]  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Goodwill Acquired Loss Before Tax $ 2.0dysl_GoodwillAcquiredLossBeforeTax
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= dysl_AcquiredCustomerBaseMember