Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information
9 Months Ended
Sep. 30, 2014
Nov. 30, 2014
Class A common stock
Nov. 30, 2014
Series B common stock
Nov. 30, 2014
Class C common stock
Entity Registrant Name Liberty Broadband Corp      
Entity Central Index Key 0001611983      
Document Type 10-Q      
Document Period End Date Sep. 30, 2014      
Amendment Flag false      
Current Fiscal Year End Date --12-31      
Entity Current Reporting Status Yes      
Entity Filer Category Non-accelerated Filer      
Entity Common Stock, Shares Outstanding   26,119,116 2,467,647 57,174,643
Document Fiscal Year Focus 2014      
Document Fiscal Period Focus Q3