Proposed Merger (Details) (AT&T Inc. [Member], USD $)	0 Months Ended
	Jul. 12, 2013 right
AT&T Inc. [Member]
Business Acquisition [Line Items]
Cash received per share	$ 15.00
Contingent value right received per share	1
Period to enter into roaming agreement upon termination of merger	30 days
Roaming agreement, period	3 years
Option to purchase Leap assets, period	30 days
Period to require AT&T purchase assets	60 days