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Business Acquisitions (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Business
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]    
Goodwill $ 5,975,803 $ 5,824,726
Series of Individually Immaterial Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Number of business acquired | Business 2  
Cost of Acquired Entity Purchase Price $ 264,000  
Intangible Assets Other than Goodwill 141,000  
Goodwill $ 145,000  
Cost of Acquired Entity Transaction Costs  
Finite lived intangible assets $ 131,000  
Indefinite lived intangible assets $ 10,000  
Weighted average useful life 17 years  
Series of Individually Immaterial Business Acquisitions [Member] | Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets $ 95,000  
Weighted average useful life 20 years  
Series of Individually Immaterial Business Acquisitions [Member] | Unpatented Technology [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets $ 36,000  
Weighted average useful life 8 years