Significant Contractual Relationship (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	5 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Site Renewal	Dec. 31, 2012	Dec. 31, 2011	Jul. 08, 2010 Subscriber Base [Member] Right	Dec. 31, 2013 Minimum [Member] Megahertz	Dec. 31, 2013 Maximum [Member] Megahertz
Significant Contractual Relationship [Line Items]
Megahertz spectrum used						800	1,900
Initial term of contract		20 years
Number of contract renewals		3
Length of renewals		10 years
Right or obligation to sell business (in hundredths)		80.00%
Net service fee (in hundredths)		12.00%	12.00%	12.00%
Acquired Finite-Lived Intangible Assets [Line Items]
Number of Virgin Mobile rights acquired to receive customers share of revenues					50,000
Proceeds from reimbursement of handset subsidies and other costs incorrectly calculated from inception			$ 11.8
Gross carrying amount					6.9
Weighted average useful life			4 years
Number of cell sites upgraded to new technology		224
Additional term of contract		5 years
Expected future net service fee (in hundredths)	14.00%
One-time fee per device for the amended Sprint agreement		$ 9.23
Servcive fees incurred during the period		$ 1.3
Number of base stations upgraded to new technology		526