Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 2,347,064	$ 2,423,783
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	24,930
Consideration transferred	24,900
Cash, Accounts Receivable, Prepaid Expenses, Deferred Income Taxes and Other	2,095
Property, Plant and Equipment(2)	5,899
Customer Relationship Assets(3)	10,634
Other Assets	622
Liabilities Assumed and Deferred Income Taxes(4)	(6,825)
Total Fair Value of Identifiable Net Assets Acquired	12,425
Goodwill	12,505
Cash Acquired from Acquisition	561
Cash Paid Related to Acquisitions in Current and Previous Years	$ 3,606
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	22 years