Fair Value of Financial Instruments and Non-Financial Assets - Measured on a Nonrecurring Basis (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended
	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Non-Operating Wireless Licenses [Member]	Dec. 31, 2011 Non-Operating Wireless Licenses [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, impairment loss	$ 46,500,000	$ 13,640,000	$ 0	$ 46,460,000
Wireless licenses, fair value					9,100,000	9,100,000
Impairments and other charges		$ 13,640,000	$ 377,000	$ 477,327,000	$ 400,000	$ 400,000