Information About the Company's Operating Segments - (Other Information) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 10,436,153	$ 11,356,020
Equity method investments in affiliates	166,565	$ 167,643
Capital expenditures	35,665
Operating Segments | GCI Holdings
Segment Reporting Information [Line Items]
Total assets	3,150,437
Equity method investments in affiliates	542
Capital expenditures	35,257
Operating Segments | Liberty Broadband
Segment Reporting Information [Line Items]
Total assets	12,225,154
Equity method investments in affiliates	12,194,726
Capital expenditures	15
Operating Segments | Corporate and other
Segment Reporting Information [Line Items]
Total assets	7,285,716
Equity method investments in affiliates	166,023
Capital expenditures	408
Consolidation, Eliminations
Segment Reporting Information [Line Items]
Total assets	(12,225,154)
Equity method investments in affiliates	(12,194,726)
Capital expenditures	$ (15)