Goodwill and Other Intangible Assets (Rollforward) (Details) $ in Thousands		6 Months Ended
		Jun. 30, 2015 USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2015	[1]	$ 4,033,174
Additions		64,108
Effect of foreign currency translation		(60,640)
Balance as of June 30, 2015		4,036,642
Rental And Management | Domestic
Goodwill [Roll Forward]
Balance as of January 1, 2015	[1]	3,356,096
Additions		12,677
Effect of foreign currency translation		0
Balance as of June 30, 2015		3,368,773
Rental And Management | International
Goodwill [Roll Forward]
Balance as of January 1, 2015	[1]	675,090
Additions		51,431
Effect of foreign currency translation		(60,640)
Balance as of June 30, 2015		665,881
Network Development Services
Goodwill [Roll Forward]
Balance as of January 1, 2015	[1]	1,988
Additions		0
Effect of foreign currency translation		0
Balance as of June 30, 2015		$ 1,988

[1] January 1, 2015 balances have been revised to reflect purchase accounting measurement period adjustments.