Business Acquisitions (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) Business	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 5,325,844	$ 4,710,691
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of business acquired | Business	6
Cost of Acquired Entity Purchase Price	$ 1,000,000
Intangible Assets Other than Goodwill	400,000
Goodwill	683,000
Cost of Acquired Entity Transaction Costs	3,600
Finite lived intangible assets	369,000
Indefinite lived intangible assets	$ 31,000
Weighted average useful life	16 years
Series of Individually Immaterial Business Acquisitions [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	$ 287,000
Weighted average useful life	18 years
Series of Individually Immaterial Business Acquisitions [Member] | Unpatented Technology [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	$ 43,000
Weighted average useful life	8 years
Series of Individually Immaterial Business Acquisitions [Member] | Software [Member]
Business Acquisition [Line Items]
Finite lived intangible assets	$ 39,000
Weighted average useful life	6 years