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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]        
Other comprehensive income (loss) other, tax $ 200 $ (400) $ 900  
Valuation allowance for deferred income tax assets 58,461 41,308 43,300  
Change in total valuation allowance 17,200 (1,900) (60,900)  
Increase in tax expense 23,300 6,100 (31,100)  
Tax effect of state and foreign net operating loss carryforwards 56,556 78,947    
Tax carryforwards expiring in 2022 300      
Tax carryforwards expiring in 2023 100      
Tax carryforwards expiring in 2024 5,500      
Tax carryforwards expiring in 2025 1,600      
Tax carryforwards expiring in 2026 200      
Tax carryforwards expiring thereafter 50,000      
Valuation allowance foreign and state net operating loss carryforwards 27,600      
Total amount of unrecognized tax benefits relating to uncertain tax positions 41,639 37,737 33,219 $ 40,878
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions 3,900   (12,100)  
Reduction related to settlement of audits 2,207 0 930  
Additions based on tax positions related to the current year 11,699 6,881 4,398  
Reduction due to expiration of certain federal and state statutes of limitations 5,413 4,702 8,717  
Additions for tax positions of prior years 230 2,339 0  
Interest and penalties expense (income) in the provision for income taxes 500 (800) (700)  
Starry Group Holdings, Inc.        
Income Taxes [Line Items]        
Change in total valuation allowance 22,700      
Foreign Operating Loss Carryforwards        
Income Taxes [Line Items]        
Change in total valuation allowance   8,500 (29,400)  
State And Local Operating Carryforwards        
Income Taxes [Line Items]        
Change in total valuation allowance   (2,400)    
Operating Loss Carryforwards, Subject To Expiration        
Income Taxes [Line Items]        
Change in total valuation allowance   $ (8,000)    
Foreign Tax Credits        
Income Taxes [Line Items]        
Change in total valuation allowance     (45,100)  
Deferred Tax Assets        
Income Taxes [Line Items]        
Change in total valuation allowance     $ 14,000  
Deferred Tax Assets No Longer Available And Currency Translation Adjustments        
Income Taxes [Line Items]        
Change in total valuation allowance (4,800)      
Gross Amount Before Balance Sheet Presentation Netting        
Income Taxes [Line Items]        
Tax effect of state and foreign net operating loss carryforwards $ 57,700