Acquisitions - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	May. 19, 2015	May. 14, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill Acquisition Related Escrow Funding	$ 78,694				$ 78,694	$ 0
Transaction Costs					26,617
Current Portion Of Escrow			$ 79,028		79,028		$ 5,583
Gain on derivative instruments	$ 85,187		85,187	$ 0	85,187	0
Interest Expense		$ 4,786	$ 37,662	$ 17,459	55,924	$ 34,898
Wood Mackenzie
Business Acquisition [Line Items]
Percent of corporate wholly-owned subsidiaries	100.00%
Net cash purchase price	$ 2,889,629
Interest Expense					$ 13,336