Document and Entity Information (USD $)	3 Months Ended
	Mar. 31, 2011	Jul. 29, 2011	Jun. 30, 2010
Entity Information [Line Items]
Entity Registrant Name	LEAP WIRELESS INTERNATIONAL INC
Entity Central Index Key	0001065049
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 801,693,696
Entity Common Stock, Shares Outstanding		78,696,465