Information About the Company's Operating Segments - (Other Information) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 10,178,562	$ 8,226,169
Investments accounted for using the equity method	169,795	$ 177,030
Capital expenditures	70,866
Operating Segments | GCI Holdings
Segment Reporting Information [Line Items]
Total assets	3,349,788
Investments accounted for using the equity method	608
Capital expenditures	69,979
Operating Segments | Liberty Broadband
Segment Reporting Information [Line Items]
Total assets	12,107,169
Investments accounted for using the equity method	12,023,742
Capital expenditures	50
Operating Segments | Corporate and other
Segment Reporting Information [Line Items]
Total assets	6,828,774
Investments accounted for using the equity method	169,187
Capital expenditures	887
Consolidation, Eliminations
Segment Reporting Information [Line Items]
Total assets	(12,107,169)
Investments accounted for using the equity method	(12,023,742)
Capital expenditures	$ (50)