Quarterly report pursuant to Section 13 or 15(d)

Information About the Company's Operating Segments (Other Information) (Details)

v3.10.0.1
Information About the Company's Operating Segments (Other Information) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total assets $ 9,344,097 $ 6,172,213
Investments accounted for using the equity method 121,880 $ 114,655
Capital expenditures 40,303  
Operating Segments    
Segment Reporting Information [Line Items]    
Total assets 21,347,025  
Investments accounted for using the equity method 12,013,517  
Capital expenditures 40,327  
Operating Segments | GCI Holdings    
Segment Reporting Information [Line Items]    
Total assets 3,530,980  
Investments accounted for using the equity method 0  
Capital expenditures 38,788  
Operating Segments | Liberty Broadband    
Segment Reporting Information [Line Items]    
Total assets 12,002,928  
Investments accounted for using the equity method 11,891,637  
Capital expenditures 24  
Operating Segments | Corporate and other    
Segment Reporting Information [Line Items]    
Total assets 5,813,117  
Investments accounted for using the equity method 121,880  
Capital expenditures 1,515  
Consolidation, Eliminations    
Segment Reporting Information [Line Items]    
Total assets (12,002,928)  
Investments accounted for using the equity method (11,891,637)  
Capital expenditures $ (24)