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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended 159 Months Ended
Dec. 30, 2020
USD ($)
Oct. 01, 2020
USD ($)
Sep. 02, 2020
USD ($)
item
Jun. 11, 2020
item
Jun. 07, 2018
USD ($)
Jun. 06, 2018
Aug. 18, 2015
USD ($)
Dec. 31, 2027
Mar. 31, 2021
USD ($)
item
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2018
USD ($)
item
Mar. 31, 2021
USD ($)
item
Jun. 14, 2025
Jun. 14, 2023
Jun. 14, 2022
Oct. 31, 2021
Dec. 31, 2020
USD ($)
Commitment and Contingencies                                      
Total                 $ 8,541,000         $ 8,541,000         $ 4,350,000
Remaining nine months of 2021                 790,000         790,000          
2022                 193,000         193,000          
2023                 301,000         301,000          
2024                 440,000         440,000          
2025                 560,000         560,000          
Thereafter                 6,257,000         6,257,000          
Expected expenditures for wireless projects                 10,000,000         10,000,000          
Expenditures For Wireless Projects Excluding Lease Cost                 756,000         756,000          
Payment to acquire certain wireless licenses and related assets                           22,000,000          
Contractual Obligation                 $ 8,541,000         $ 8,541,000         4,350,000
Percentage of Population 5G Services offered                 70.00%         70.00% 75.00% 50.00% 20.00% 40.00%  
Percentage of Population Northstar Wireless and SNR Wireless offered               75.00%                      
FCC authorizations                 $ 28,024,606         $ 28,024,606         26,903,939
Impairment of long-lived assets                       $ 356,418              
Commitments relating to AWS-3 Auction                                      
Noncontrolling Interest in Variable Interest Entity                 10,000,000         10,000,000          
Capitalized interest on FCC authorizations [Member]                                      
Commitment and Contingencies                                      
Percentage of Population 5G Services offered                             70.00%        
FCC authorizations                 6,000,000         6,000,000          
Northstar Manager LLC | Class B common stock                                      
Commitment and Contingencies                                      
Ownership percentage 97.00%                                    
Payment For Purchase Agreement $ 312,000                                    
Equity Method Investment, Ownership Percentage 3.00%                                    
Wireless                                      
Commitment and Contingencies                                      
Payment to acquire certain wireless licenses and related assets                           12,000,000          
FCC authorizations                 12,366,067         12,366,067          
H Block Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 1,671,506         1,671,506          
DBS Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 677,409         677,409          
700 MHz Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 711,871         711,871          
600 MHz Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 6,211,154         6,211,154          
MVDDS Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 24,000         24,000          
28 GHz Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 2,883         2,883          
24 GHz Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 11,772         11,772          
37 Ghz, 39 Ghz and 47 Ghz Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 202,533         202,533          
Licenses 3550-3650 MHz                                      
Commitment and Contingencies                                      
Payment to acquire certain wireless licenses and related assets   $ 730,000 $ 913,000             $ 100,000 $ 83,000                
FCC authorizations                 912,939         912,939          
Number of priority access licenses | item     5,492                                
Northstar Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 $ 5,618,930         5,618,930          
AWS-3 Licenses                                      
Commitment and Contingencies                                      
Accelerated build out period                 2 years                    
FCC authorizations                 $ 9,890,389         9,890,389          
AWS-4 Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 1,940,000         1,940,000          
SNR Licenses                                      
Commitment and Contingencies                                      
FCC authorizations                 4,271,459         4,271,459          
Capitalized Interest                                      
Commitment and Contingencies                                      
FCC authorizations                 5,768,150         5,768,150          
Ghz 3.7 to 3.98                                      
Commitment and Contingencies                                      
Payment to acquire certain wireless licenses and related assets                 3,000                    
Payments For Asset Purchase Deposit                 340,000                    
Proceeds from Refund of Deposits on Auction                 337,000                    
Northstar Spectrum And SNR Holdco                                      
Commitment and Contingencies                                      
Ownership interest                 362,000         362,000          
Commitments relating to AWS-3 Auction                                      
Noncontrolling Interest in Variable Interest Entity                 $ 10,000,000         $ 10,000,000          
Northstar Spectrum And SNR Holdco | AWS-3 Licenses                                      
Commitment and Contingencies                                      
Interim Build-out Requirement (as a percent)                 40.00%                    
Final Build-out Requirement (as a percent)                 75.00%                    
Accelerated period to meet Final Build-Out Requirement on failure to meet Interim Build-Out Requirement                 2 years                    
Commitments relating to AWS-3 Auction                                      
Percentage of bidding credit                 25.00%                    
Northstar Wireless or Northstar Spectrum                                      
Commitment and Contingencies                                      
Interim payment percentage                 15.00%                    
Re-Auction payment                 $ 1,892,000                    
Overpayment of interim payment                 $ 334,000                    
Northstar Wireless or Northstar Spectrum | Preferred Class A                                      
Commitment and Contingencies                                      
Ownership percentage                 100.00%                    
Northstar Wireless or Northstar Spectrum | Northstar Manager LLC                                      
Commitments relating to AWS-3 Auction                                      
Controlling interest owned by other companies                 15.00%                    
Equity contribution                         $ 133,000            
Northstar Wireless or Northstar Spectrum | American II                                      
Commitment and Contingencies                                      
Ownership percentage                 85.00%                    
Loan made                 $ 69,000                    
Commitments relating to AWS-3 Auction                                      
Equity contribution                         7,621,000            
Northstar Wireless or Northstar Spectrum | AWS 3 Auction                                      
Commitment and Contingencies                                      
Interim Payment                 $ 334,000                    
Interim payment percentage                 15.00%                    
Northstar Wireless or Northstar Spectrum | Northstar Licenses                                      
Commitment and Contingencies                                      
Number of wireless spectrum licenses | item                 261         261          
Commitments relating to AWS-3 Auction                                      
Gross winning bids                 $ 5,619,000                    
Bidding credit value             $ 1,961,000                        
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses                                      
Commitment and Contingencies                                      
Non-payment gross winning bids                 2,226,000         $ 2,226,000          
Commitments relating to AWS-3 Auction                                      
Gross winning bids                 $ 7,845,000                    
Percentage of bidding credit                 25.00%                    
Net winning bid                 $ 5,884,000                    
Northstar Wireless or Northstar Spectrum | SNR Licenses                                      
Commitments relating to AWS-3 Auction                                      
Percentage of bidding credit             25.00%                        
SNR Wireless or SNR Wireless Holdco                                      
Commitment and Contingencies                                      
Non-payment gross winning bids                 $ 1,211,000         $ 1,211,000          
Interim payment percentage                 15.00%                    
Re-Auction payment                 $ 1,029,000                    
Ownership interest                                     $ 351,000
Overpayment of interim payment                 $ 182,000                    
SNR Wireless or SNR Wireless Holdco | Maximum                                      
Commitment and Contingencies                                      
Preferred stock quarterly distribution (as a percent)         12.00%                            
SNR Wireless or SNR Wireless Holdco | Minimum                                      
Commitment and Contingencies                                      
Preferred stock quarterly distribution (as a percent)         8.00%                            
SNR Wireless or SNR Wireless Holdco | SNR Wireless Management LLC                                      
Commitments relating to AWS-3 Auction                                      
Controlling interest owned by other companies                 15.00%                    
Equity contribution                         93,000            
SNR Wireless or SNR Wireless Holdco | American II                                      
Commitment and Contingencies                                      
Window of days for management to put its interest         90 days 30 days                          
Additional days allowed for management to put its interest         90 days                            
SNR Wireless or SNR Wireless Holdco | American II | Maximum                                      
Commitment and Contingencies                                      
Preferred stock quarterly distribution (as a percent)         12.00%                            
SNR Wireless or SNR Wireless Holdco | American II | Minimum                                      
Commitment and Contingencies                                      
Preferred stock quarterly distribution (as a percent)         8.00%                            
SNR Wireless or SNR Wireless Holdco | American III                                      
Commitment and Contingencies                                      
Number of wireless spectrum licenses | item                 244         244          
Loan made                 $ 344,000                    
Debt outstanding amount                         5,065,000            
Principal amount of debt                         500,000            
Window of days for management to put its interest         90 days 30 days                          
Additional days allowed for management to put its interest         90 days                            
Additional loan to pay gross winning bids                 344,000                    
Commitments relating to AWS-3 Auction                                      
Equity contribution                         $ 5,590,000            
Gross winning bids                 $ 4,271,000                    
SNR Wireless or SNR Wireless Holdco | American III | Preferred Class A                                      
Commitment and Contingencies                                      
Number shares issued in conversion | item                         5,065,415            
Preferred stock quarterly distribution (as a percent)                         12.00%            
SNR Wireless or SNR Wireless Holdco | American III | Maximum                                      
Commitment and Contingencies                                      
Interest rate (as a percent)                         12.00%            
SNR Wireless or SNR Wireless Holdco | American III | Minimum                                      
Commitment and Contingencies                                      
Interest rate (as a percent)                 6.00%         6.00%          
SNR Wireless or SNR Wireless Holdco | AWS 3 Auction                                      
Commitments relating to AWS-3 Auction                                      
Gross winning bids                 $ 5,482,000                    
SNR Wireless or SNR Wireless Holdco | AWS-3 Licenses                                      
Commitment and Contingencies                                      
Non-payment gross winning bids                 1,211,000         $ 1,211,000          
SNR Wireless or SNR Wireless Holdco | SNR Licenses                                      
Commitment and Contingencies                                      
Interim Payment                 182,000                    
Non-payment gross winning bids                 $ 1,211,000         1,211,000          
Interim payment percentage                 15.00%                    
Additional Bid Withdrawal Payment                 $ 3,000                    
Commitments relating to AWS-3 Auction                                      
Percentage of bidding credit                 25.00%                    
Net winning bid                 $ 4,112,000                    
Bid withdrawal payment                 $ 8,000                    
Bidding credit value             $ 1,370,000                        
SNR Wireless or SNR Wireless Holdco Class B Interests [Member] | American III                                      
Commitment and Contingencies                                      
Ownership percentage                 85.00%                    
SNR Wireless or SNR Wireless Holdco Class A Interests [Member] | American III                                      
Commitment and Contingencies                                      
Ownership percentage                 100.00%                    
American II | Northstar Manager LLC | Class B common stock                                      
Commitment and Contingencies                                      
Ownership percentage 80.00%                                    
Prior Arrangement | Northstar Licenses                                      
Commitment and Contingencies                                      
Non-payment gross winning bids                 $ 2,226,000         2,226,000          
Prior Arrangement | Northstar Wireless or Northstar Spectrum                                      
Commitment and Contingencies                                      
Non-payment gross winning bids                 $ 2,226,000         $ 2,226,000          
Commitments relating to AWS-3 Auction                                      
Number of licenses returned | item                 84                    
Prior Arrangement | SNR Wireless or SNR Wireless Holdco | SNR Licenses                                      
Commitments relating to AWS-3 Auction                                      
Number of licenses returned | item                 113                    
Northstar Operative Agreement | Northstar Spectrum And SNR Holdco | American II                                      
Commitment and Contingencies                                      
Debt outstanding amount                         $ 6,870,000            
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II                                      
Commitment and Contingencies                                      
Principal amount of debt                         $ 500,000            
Removal of consent for unsecured financing and equipment financing         $ 25,000                            
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II | Preferred Class A                                      
Commitment and Contingencies                                      
Number shares issued in conversion | item                         6,870,493            
Preferred stock quarterly distribution (as a percent)                         12.00%            
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II | Maximum                                      
Commitment and Contingencies                                      
Interest rate (as a percent)                         12.00%            
Loan balance maturity period         10 years                            
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II | Minimum                                      
Commitment and Contingencies                                      
Interest rate (as a percent)                         6.00%            
Loan balance maturity period           7 years                          
SNR Operative Agreement | SNR Wireless or SNR Wireless Holdco | American III                                      
Commitment and Contingencies                                      
Loan balance maturity period         10 years 7 years                          
Removal of consent for unsecured financing and equipment financing         $ 25,000                            
Lease Agreement With Crown Castle                                      
Commitment and Contingencies                                      
Area of Leased Space | item                 20,000         20,000          
Number Of Communication Towers | item       20,000                              
Master Network Service Agreement                                      
Commitment and Contingencies                                      
Master networ service agreement period                 7 years                    
NBIoT capitalized costs                                      
Commitment and Contingencies                                      
Impairment of long-lived assets                       $ 253,000              
Interest expense on finance lease obligations                                      
Commitment and Contingencies                                      
Total                 $ 4,191,000         $ 4,191,000          
Contractual Obligation                 $ 4,191,000         $ 4,191,000          
SNR Credit Agreement | SNR Wireless or SNR Wireless Holdco                                      
Commitment and Contingencies                                      
Loan made                         $ 500,000            
SNR Credit Agreement | SNR Wireless or SNR Wireless Holdco | American III                                      
Commitment and Contingencies                                      
Loan made                         500,000            
Northstar Credit Agreement | Northstar Wireless or Northstar Spectrum | American II                                      
Commitment and Contingencies                                      
Loan made                         500,000            
Principal amount of debt                         $ 500,000