Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Other comprehensive income (loss) other, tax	$ 400,000	$ (200,000)	$ 400,000
Foreign currency translation adjustment, tax	0	0	0
Valuation allowance for deferred income tax assets	40,013,000	58,461,000	41,300,000
Change in total valuation allowance, increase (decrease)	(18,500,000)	17,200,000	(1,900,000)
Increase (decrease) in tax expense	(20,200,000)	23,300,000	6,100,000
Change in expense related to foreign NOLs	2,900,000
Marketable security, realized gain (loss)	(91,500,000)
Tax effect of state and foreign net operating loss carryforwards	62,523,000	56,556,000
Tax carryforwards expiring in year one	100,000
Tax carryforwards expiring in year two	5,700,000
Tax carryforwards expiring in year three	1,100,000
Tax carryforwards expiring in year four	1,100,000
Tax carryforwards expiring thereafter	55,900,000
Valuation allowance foreign and state net operating loss carryforwards	30,400,000
Total amount of unrecognized tax benefits relating to uncertain tax positions	45,136,000	41,639,000	37,737,000	$ 33,219,000
Additions based on tax positions related to the current year	10,304,000	11,699,000	6,881,000
Reduction related to settlement of audits	0	2,207,000	0
Reduction due to expiration of certain federal and state statutes of limitations	6,807,000	5,413,000	4,702,000
Interest and penalties expense (income) in the provision for income taxes	500,000	500,000	(800,000)
Starry Group Holdings, Inc.
Income Taxes [Line Items]
Change in total valuation allowance, increase (decrease)		22,700,000
Unrealized gain (loss) on investments		(91,500,000)
Deferred tax asset, valuation allowance, released	22,700,000
Foreign Operating Loss Carryforwards
Income Taxes [Line Items]
Change in total valuation allowance, increase (decrease)			8,500,000
State And Local Operating Carryforwards
Income Taxes [Line Items]
Change in total valuation allowance, increase (decrease)			$ (2,400,000)
Deferred Tax Assets No Longer Available And Currency Translation Adjustments
Income Taxes [Line Items]
Change in total valuation allowance, increase (decrease)		$ (4,800,000)
Foreign Net Operating Losses
Income Taxes [Line Items]
Change in total valuation allowance, increase (decrease)	5,600,000
Foreign Currency Translation Adjustments
Income Taxes [Line Items]
Change in total valuation allowance, increase (decrease)	1,700,000
Gross Amount Before Balance Sheet Presentation Netting
Income Taxes [Line Items]
Tax effect of state and foreign net operating loss carryforwards	$ 63,900,000