Arrangements with Variable Interest Entities and Joint Ventures - (Details) (USD $) In Thousands, unless otherwise specified	Oct. 01, 2012 Savary Island Acquisition [Member]	Dec. 31, 2011 Variable Interest Entity, Total Assets [Member] Savary Island [Member]	Dec. 31, 2011 Cash and Cash Equivalents [Member] Savary Island [Member]	Dec. 31, 2011 Wireless Licenses [Member] Savary Island [Member]	Dec. 31, 2011 Assets Held for Sale [Member] Savary Island [Member]		Dec. 31, 2011 Variable Interest Entity, Total Liabilities [Member] Savary Island [Member]	Dec. 31, 2011 Other Current Liabilities [Member] Savary Island [Member]
Variable Interest Entity [Line Items]
Remaining controlling interest acquired	15.00%
Assets		$ 134,221	$ 7,084	$ 41,947	$ 85,190	[1]
Liabilities							$ 5	$ 5

[1] Represents the carrying value of wireless licenses sold by Savary Island to Verizon Wireless on August 28, 2012 under the license sale transaction discussed in Note 6