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Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Total operating revenues $ 308,521 $ 327,497 $ 897,495 $ 1,001,630  
Selling, general and administrative 106,188 116,559 331,206 370,693  
Expenses related to strategic alternatives review (included in Selling, general and administrative) 4,100 1,500 6,200 31,100  
Equity in earnings of unconsolidated entities 69,838 43,415 149,309 125,117  
Interest and dividend income 15,663 7,952 28,044 20,268  
Short-term imputed spectrum lease income 30,413 0 30,413 0  
Income (loss) before income taxes 6,009 (130,020) 3,663 (138,590)  
Depreciation, amortization and accretion (91,746) (80,882) (262,095) (240,880)  
Loss on impairment of licenses (47,679) (136,234) (47,679) (136,234)  
Loss on asset disposals, net (729) (2,823) (8,524) (8,898)  
Gain on sale of business and other exit costs, net (2,844) 11,733 6,032 11,733  
Gain (loss) on license sales and exchanges, net 1,323 2,200 6,123 (4,360)  
Interest expense (47,278) (32,694) (100,352) (78,918)  
Investments in unconsolidated entities 500,997 524,209 500,997 524,209 $ 500,471
Total assets 8,532,378 [1] 13,726,450 8,532,378 [1] 13,726,450 $ 13,682,232 [1]
Capital expenditures 109,998 83,684 268,729 259,292  
Service          
Segment Reporting Information [Line Items]          
Total operating revenues 255,933 279,420 777,677 860,876  
Cost of goods and services 123,180 134,344 356,781 403,578  
Equipment and product sales          
Segment Reporting Information [Line Items]          
Total operating revenues 6,750 22,408 20,155 64,163  
Cost of goods and services 5,452 20,316 17,580 56,858  
All Other          
Segment Reporting Information [Line Items]          
Total operating revenues 6,512 39,853 19,271 130,739  
Short-term imputed spectrum lease income 0   0    
Income (loss) before income taxes (38,180) (25,987) (92,251) (96,326)  
Depreciation, amortization and accretion (977) (981) (2,757) (6,875)  
Loss on impairment of licenses 0 0 0 0  
Loss on asset disposals, net 0 53 (14) 36  
Gain on sale of business and other exit costs, net 0 11,733 797 11,733  
Gain (loss) on license sales and exchanges, net 0 0 0 0  
Interest expense (40,166) (29,715) (88,287) (73,238)  
Investments in unconsolidated entities 44,876 41,996 44,876 41,996  
Total assets 697,365 286,735 697,365 286,735  
Capital expenditures (358) 1,374 265 5,653  
Array          
Segment Reporting Information [Line Items]          
Gain on sale of business and other exit costs, net     47,700    
Array | Operating segment          
Segment Reporting Information [Line Items]          
Total operating revenues 47,119 25,739 102,632 76,845  
Selling, general and administrative (20,525) (21,176) (69,063) (78,997)  
Expenses related to strategic alternatives review (included in Selling, general and administrative) 489 1,253 2,349 19,913  
Equity in earnings of unconsolidated entities 69,811 43,109 147,453 123,445  
Interest and dividend income 8,909 3,552 15,267 9,076  
Other segment items 254 0 253 0  
Adjusted EBITDA 85,081 34,214 142,229 97,460  
Short-term imputed spectrum lease income 30,413   30,413    
Depreciation, amortization and accretion (11,868) (12,237) (35,860) (35,058)  
Loss on impairment of licenses (47,679) (136,234) (47,679) (136,234)  
Loss on asset disposals, net (707) (196) (620) (590)  
Gain on sale of business and other exit costs, net 0 0 0 0  
Gain (loss) on license sales and exchanges, net 1,323 2,200 6,123 (4,360)  
Interest expense (8,855) (4,241) (16,233) (9,201)  
Investments in unconsolidated entities 452,174 478,263 452,174 478,263  
Total assets 4,918,327 10,516,361 4,918,327 10,516,361  
Capital expenditures 7,927 4,406 16,978 11,570  
Array | Operating segment | Service          
Segment Reporting Information [Line Items]          
Cost of goods and services (20,976) (18,263) (56,662) (52,822)  
Array | Operating segment | Equipment and product sales          
Segment Reporting Information [Line Items]          
Cost of goods and services 0 0 0 0  
Array | Intersegment Revenues          
Segment Reporting Information [Line Items]          
Total operating revenues 0 0 0 0  
Array | Operating Segments Excluding Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total operating revenues 47,119 25,739 102,632 76,845  
TDS Telecom          
Segment Reporting Information [Line Items]          
Total operating revenues 255,111 262,662 777,403 796,562  
TDS Telecom | Operating segment          
Segment Reporting Information [Line Items]          
Total operating revenues 254,890 261,905 775,592 794,046  
Selling, general and administrative (79,201) (80,814) (244,905) (236,134)  
Expenses related to strategic alternatives review (included in Selling, general and administrative) 3,497 0 3,497 0  
Equity in earnings of unconsolidated entities 3 1 4 1  
Interest and dividend income 1,824 1,368 4,918 3,591  
Other segment items 1,692 897 5,262 2,664  
Adjusted EBITDA 80,491 82,796 245,352 269,402  
Short-term imputed spectrum lease income 0   0    
Depreciation, amortization and accretion (78,901) (67,664) (223,478) (198,947)  
Loss on impairment of licenses 0 0 0 0  
Loss on asset disposals, net (22) (2,680) (7,890) (8,344)  
Gain on sale of business and other exit costs, net (2,844) 0 5,235 0  
Gain (loss) on license sales and exchanges, net 0 0 0 0  
Interest expense 1,743 1,262 4,168 3,521  
Investments in unconsolidated entities 3,947 3,950 3,947 3,950  
Total assets 2,916,686 2,923,354 2,916,686 2,923,354  
Capital expenditures 102,429 77,904 251,486 242,069  
TDS Telecom | Operating segment | Service          
Segment Reporting Information [Line Items]          
Cost of goods and services (102,253) (101,107) (300,265) (296,768)  
TDS Telecom | Operating segment | Equipment and product sales          
Segment Reporting Information [Line Items]          
Cost of goods and services (182) (211) (562) (514)  
TDS Telecom | Intersegment Revenues          
Segment Reporting Information [Line Items]          
Total operating revenues 221 757 1,811 2,516  
TDS Telecom | Operating Segments Excluding Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total operating revenues 255,111 262,662 777,403 796,562  
Total          
Segment Reporting Information [Line Items]          
Total operating revenues 302,009 287,644 878,224 870,891  
Expenses related to strategic alternatives review (included in Selling, general and administrative) (3,986) (1,253) (5,846) (19,913)  
Adjusted EBITDA 165,572 117,010 387,581 366,862  
Short-term imputed spectrum lease income 30,413   30,413    
Depreciation, amortization and accretion (90,769) (79,901) (259,338) (234,005)  
Loss on impairment of licenses (47,679) (136,234) (47,679) (136,234)  
Loss on asset disposals, net (729) (2,876) (8,510) (8,934)  
Gain on sale of business and other exit costs, net (2,844) 0 5,235 0  
Gain (loss) on license sales and exchanges, net 1,323 2,200 6,123 (4,360)  
Interest expense (7,112) (2,979) (12,065) (5,680)  
Investments in unconsolidated entities 456,121 482,213 456,121 482,213  
Total assets 7,835,013 13,439,715 7,835,013 13,439,715  
Capital expenditures 110,356 82,310 268,464 253,639  
Total | Intersegment Revenues          
Segment Reporting Information [Line Items]          
Total operating revenues 221 757 1,811 2,516  
Total | Operating Segments Excluding Intersegment Elimination          
Segment Reporting Information [Line Items]          
Total operating revenues 302,230 288,401 880,035 873,407  
Total | Intersegment Eliminations          
Segment Reporting Information [Line Items]          
Total operating revenues $ (221) $ (757) $ (1,811) $ (2,516)  
[1] The consolidated total assets as of September 30, 2025 and December 31, 2024, include assets held by current consolidated variable interest entities (VIEs) of $34.9 million and $165.7 million, respectively, which are not available to be used to settle the obligations of TDS. The consolidated total liabilities as of September 30, 2025 and December 31, 2024, include certain liabilities of current consolidated VIEs of $9.5 million and $21.6 million, respectively, for which the creditors of the VIEs have no recourse to the general credit of TDS. See Note 12 — Variable Interest Entities for additional information.