| Component: (Network and Table) | |
|---|---|
| Network | 00400 - Statement - Condensed Combined Statements of Cash Flows (http://ir.libertybroadband.com/role/StatementCondensedCombinedStatementsOfCashFlows)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001611983 (http://www.sec.gov/CIK) | 
| Condensed Combined Statements of Cash Flows | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31  | 2015-01-01 - 2015-12-31  | 2014-01-01 - 2014-12-31  | |
Condensed Combined Statements of Cash Flows  | |||
Cash flows from operating activities:  | |||
Net earnings (loss)  | 917,303,000    | (50,187,000)   | (134,605,000)   | 
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:  | |||
Depreciation and amortization  | 4,005,000    | 6,088,000    | 9,043,000    | 
Stock-based compensation  | |||
Excess tax benefit from stock-based compensation  | |||
Impairment of intangible assets  | 20,669,000    | 35,221,000    | |
Cash payments for stock-based compensation  | |||
Share of earnings (losses) of affiliates  | (641,544,000)   | 120,962,000    | 127,573,000    | 
Gain (loss) on dilution of investment in affiliate  | (770,766,000)   | 7,198,000    | 87,158,000    | 
Realized and unrealized (gains) losses on financial instruments, net  | (94,122,000)   | (2,619,000)   | (51,189,000)   | 
Deferred Income Tax Expense (Benefit)  | (  | (  | |
Other, net  | (  | ||
Changes in operating assets and liabilities:  | |||
Current and other assets  | (  | ||
Payables and other liabilities  | (  | (  | (  | 
Net cash provided by operating activities  | (  | ||
Cash flows from investing activities:  | |||
Capital expended for property and equipment  | (  | (  | (  | 
Cash paid for acquisitions, net of cash acquired  | (  | ||
Investments in equity method affiliates  | (  | (  | |
Amounts loaned to former parent  | (  | ||
Repayments by former parent on loan receivable  | |||
Purchases of short term investments and other marketable securities  | (  | (  | (  | 
Sales of short term investments and other marketable securities  | |||
Other investing activities, net  | (  | (  | |
Net cash used in investing activities  | (  | (  | (  | 
Cash flows from financing activities:  | |||
Cash received from rights offering  | |||
Borrowings of debt  | |||
Cash received from issuance of Series C Liberty Broadband common stock  | |||
Repayments of debt  | (  | ||
Contribution from (distribution to) former parent, net  | (  | ||
Proceeds (payments) from issuances of financial instruments  | (  | ||
Payments from settlements of financial instruments  | (  | (  | |
Other financing activities, net  | |||
Net cash provided by (used in) financing activities  | |||
Net increase in cash  | (  | ||
Cash and cash equivalents, beginning of period  | 655,079,000    | ||
Cash and cash equivalents, end of period  | 205,728,000    | 655,079,000    | 44,809,000    | 
Supplemental Cash Flow Information [Abstract]  | |||
Cash paid for interest  | |||
Cash paid (received) for taxes  | (  | ||