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Summary of Significant Accounting Policies (Details 7) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Long Lived Assets      
Impairment charges recorded on long lived assets $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Goodwill      
Impairment charges recorded on goodwill $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss
Trade names | Minimum      
Intangible Assets Acquired in Business Combinations      
Estimated useful lives 1 year    
Trade names | Maximum      
Intangible Assets Acquired in Business Combinations      
Estimated useful lives 15 years    
Customer relationships | Minimum      
Intangible Assets Acquired in Business Combinations      
Estimated useful lives 5 years    
Customer relationships | Maximum      
Intangible Assets Acquired in Business Combinations      
Estimated useful lives 10 years    
Technology | Minimum      
Intangible Assets Acquired in Business Combinations      
Estimated useful lives 3 years    
Technology | Maximum      
Intangible Assets Acquired in Business Combinations      
Estimated useful lives 10 years