Goodwill and Other Intangible Assets (Rollforwardl) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Goodwill [Line Items]
Balance as of January 1, 2013	$ 2,881,959	[1]
Additions	14,796
Effect of foreign currency translation	1,883
Balance as of March 31, 2013	2,898,638
Rental And Management [Member] | Domestic [Member]
Goodwill [Line Items]
Balance as of January 1, 2013	2,320,777	[1]
Additions	0
Effect of foreign currency translation	0
Balance as of March 31, 2013	2,320,777
Rental And Management [Member] | International [Member]
Goodwill [Line Items]
Balance as of January 1, 2013	559,182	[1]
Additions	14,796
Effect of foreign currency translation	1,883
Balance as of March 31, 2013	575,861
Network Development Services [Member]
Goodwill [Line Items]
Balance as of January 1, 2013	2,000	[1]
Additions	0
Effect of foreign currency translation	0
Balance as of March 31, 2013	$ 2,000

[1] Balances have been revised to reflect purchase accounting measurement period adjustments.