Goodwill and Other Intangible Assets (Rollforwardl) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Goodwill, Beginning Balance	$ 2,676,290	[1]
Additions	248,116
Effect of foreign currency translation	(12,360)
Goodwill, Ending Balance	2,912,046
Rental And Management [Member] | Domestic [Member]
Goodwill, Beginning Balance	2,249,444	[1]
Additions	92,420
Effect of foreign currency translation	0
Goodwill, Ending Balance	2,341,864
Rental And Management [Member] | International [Member]
Goodwill, Beginning Balance	424,846	[1]
Additions	155,696
Effect of foreign currency translation	(12,360)
Goodwill, Ending Balance	568,182
Network Development Services [Member]
Goodwill, Beginning Balance	2,000	[1]
Additions	0
Effect of foreign currency translation	0
Goodwill, Ending Balance	$ 2,000

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