Equity-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2021	Dec. 31, 2025	Dec. 31, 2024
Equity-Based Compensation (Details) [Line Items]
Total compensation cost related to nonvested awards not yet recognized		$ 10.8
Number of share-based options, outstanding		3,827,000	3,628,000
Intrinsic value of options exercised
Weighted-average period over which is expected to recognized		2 years 9 months 3 days
Common Stock [Member]
Equity-Based Compensation (Details) [Line Items]
Number of shares approved and issued as stock options and restricted stock awards		120,265	269,453
Expected dividend rate		0.00%
NextNav 2021 Omnibus Incentive Plan (the “Omnibus Plan”) [Member]
Equity-Based Compensation (Details) [Line Items]
Number of shares available for issuance		5,636,259
Service-based awards vesting period		4 years
Number of shares approved and issued as stock options and restricted stock awards	12,818,902
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award		14,176,507
Stock Options
Equity-Based Compensation (Details) [Line Items]
Equity-based compensation expense		$ 3.7	$ 3.2
Weighted average grant date fair value of options granted		$ 12.73	$ 5.08
Intrinsic value of options exercised		$ 13.5	$ 12.8
Expected dividend rate
Total Restricted Awards [Member]
Equity-Based Compensation (Details) [Line Items]
Equity-based compensation expense		$ 12.9	$ 10.7
Weighted-average period over which is expected to recognized		2 years 1 month 17 days
Weighted average grant date fair value		$ 16.8
Weighted averag fair value		11.6
Total compensation cost related to RSAs and RSUs not yet recognized		$ 15.8