Liberty Broadband Corporation Quarterly report pursuant to Section 13 or 15(d)

Information About the Company's Operating Segments - (Performance Measures) (Details)

Information About the Company's Operating Segments - (Performance Measures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 227,044	$ 210,146	$ 662,346	$ 504,840
GCI Holdings
Segment Reporting Information [Line Items]
Total revenue	221,028	205,046	645,218	489,619
GCI Holdings \| Lease, grant, and revenue from subsidies
Segment Reporting Information [Line Items]
Total revenue	22,472	24,226	67,914	55,114
GCI Holdings \| Consumer Revenue \| Wireless
Segment Reporting Information [Line Items]
Revenue from contracts with customers	29,509	25,584	84,506	62,312
GCI Holdings \| Consumer Revenue \| Data
Segment Reporting Information [Line Items]
Revenue from contracts with customers	42,920	39,652	125,555	88,921
GCI Holdings \| Consumer Revenue \| Video
Segment Reporting Information [Line Items]
Revenue from contracts with customers	21,194	22,272	63,255	50,180
GCI Holdings \| Consumer Revenue \| Voice
Segment Reporting Information [Line Items]
Revenue from contracts with customers	4,051	4,368	12,833	10,246
GCI Holdings \| Business Revenue \| Wireless
Segment Reporting Information [Line Items]
Revenue from contracts with customers	20,060	18,071	57,837	44,889
GCI Holdings \| Business Revenue \| Data
Segment Reporting Information [Line Items]
Revenue from contracts with customers	69,960	59,585	201,803	154,239
GCI Holdings \| Business Revenue \| Video
Segment Reporting Information [Line Items]
Revenue from contracts with customers	4,115	4,927	11,928	9,436
GCI Holdings \| Business Revenue \| Voice
Segment Reporting Information [Line Items]
Revenue from contracts with customers	6,747	6,361	19,587	14,282
Corporate and other
Segment Reporting Information [Line Items]
Total revenue	$ 6,016	$ 5,100	$ 17,128	$ 15,221