Basis of Presentation and Consolidation - Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheet [Abstract]
Goodwill	$ 157,380	$ 157,380	$ 157,380	$ 361,378	$ 601,878
Deferred income tax assets, net	103,827	103,827	109,128	40,631
Total Assets	4,943,362	4,943,362	5,025,129	4,851,229
Distributions in excess of accumulated earnings	(3,703,515)	(3,703,515)	(3,708,240)	(3,483,634)
Total Uniti shareholders' deficit	(2,484,676)	(2,484,676)	(2,486,392)	(2,273,577)
Operating partnership units	2,023	2,023	2,021	2,121
Total shareholders' deficit	(2,482,403)	(2,482,403)	(2,484,121)	(2,271,206)	(2,113,774)	$ (2,072,376)
Total Liabilities and Shareholders' Deficit	4,943,362	4,943,362	5,025,129	4,851,229
Condensed Consolidated Statement of Loss and Comprehensive Loss [Abstract]
Goodwill impairment	203,998	203,998	203,998	240,500	0
(Loss) income before income taxes and equity in earnings from unconsolidated entities	(175,696)	(177,358)	(152,885)	(27,858)	117,727
Income tax benefit	(56,130)	(62,899)	(68,474)	(17,365)	(4,916)
Net (loss) income	(118,896)	(112,469)	(81,749)	(8,122)	124,745
Net (loss) income attributable to noncontrolling interests	(53)	(50)	(36)	153	1,085
Net (loss) income attributable to shareholders	(118,843)	(112,419)	(81,713)	(8,275)	123,660
Net (loss) income attributable to common shares	(119,169)	(113,324)	(82,940)	(9,430)	122,573
Comprehensive loss	(118,896)	(112,469)	(81,749)	1,121	136,062
Comprehensive (loss) income attributable to noncontrolling interest	(53)	(50)	(36)	232	1,199
Comprehensive (loss) income attributable to shareholders	$ (118,843)	$ (112,419)	$ (81,713)	$ 889	$ 134,863
Basic (in dollars per share)	$ (0.50)	$ (0.48)	$ (0.35)	$ (0.04)	$ 0.53
Diluted (in dollars per share)	$ (0.50)	$ (0.48)	$ (0.35)	$ (0.04)	$ 0.51
Supplemental Cash Flow Elements [Abstract]
Net (loss) income	$ (118,896)	$ (112,469)	$ (81,749)	$ (8,122)	$ 124,745
Deferred income taxes		(63,196)	(68,497)	(28,909)	(6,467)
Goodwill impairment	203,998	203,998	203,998	240,500	0
Net cash provided by (used in) operating activities		190,575	$ 353,129	$ 460,115	$ 499,157
As Reported
Condensed Consolidated Balance Sheet [Abstract]
Goodwill	208,378	208,378
Deferred income tax assets, net	90,792	90,792
Total Assets	4,981,325	4,981,325
Distributions in excess of accumulated earnings	(3,665,569)	(3,665,569)
Total Uniti shareholders' deficit	(2,446,730)	(2,446,730)
Operating partnership units	2,040	2,040
Total shareholders' deficit	(2,444,440)	(2,444,440)
Total Liabilities and Shareholders' Deficit	4,981,325	4,981,325
Condensed Consolidated Statement of Loss and Comprehensive Loss [Abstract]
Goodwill impairment	153,000	153,000
(Loss) income before income taxes and equity in earnings from unconsolidated entities	(124,698)	(126,360)
Income tax benefit	(43,095)	(49,864)
Net (loss) income	(80,933)	(74,506)
Net (loss) income attributable to noncontrolling interests	(36)	(33)
Net (loss) income attributable to shareholders	(80,897)	(74,473)
Net (loss) income attributable to common shares	(81,223)	(75,378)
Comprehensive loss	(80,933)	(74,506)
Comprehensive (loss) income attributable to noncontrolling interest	(36)	(33)
Comprehensive (loss) income attributable to shareholders	$ (80,897)	$ (74,473)
Basic (in dollars per share)	$ (0.34)	$ (0.32)
Diluted (in dollars per share)	$ (0.34)	$ (0.32)
Supplemental Cash Flow Elements [Abstract]
Net (loss) income	$ (80,933)	$ (74,506)
Deferred income taxes		(50,161)
Goodwill impairment	153,000	153,000
Net cash provided by (used in) operating activities		190,575
Adjustments | Income Tax Effects of Goodwill Impairment
Condensed Consolidated Balance Sheet [Abstract]
Goodwill	(50,998)	(50,998)
Deferred income tax assets, net	13,035	13,035
Total Assets	(37,963)	(37,963)
Distributions in excess of accumulated earnings	(37,946)	(37,946)
Total Uniti shareholders' deficit	(37,946)	(37,946)
Operating partnership units	(17)	(17)
Total shareholders' deficit	(37,963)	(37,963)
Total Liabilities and Shareholders' Deficit	(37,963)	(37,963)
Condensed Consolidated Statement of Loss and Comprehensive Loss [Abstract]
Goodwill impairment	50,998	50,998
(Loss) income before income taxes and equity in earnings from unconsolidated entities	(50,998)	(50,998)
Income tax benefit	(13,035)	(13,035)
Net (loss) income	(37,963)	(37,963)
Net (loss) income attributable to noncontrolling interests	(17)	(17)
Net (loss) income attributable to shareholders	(37,946)	(37,946)
Net (loss) income attributable to common shares	(37,946)	(37,946)
Comprehensive loss	(37,963)	(37,963)
Comprehensive (loss) income attributable to noncontrolling interest	(17)	(17)
Comprehensive (loss) income attributable to shareholders	$ (37,946)	$ (37,946)
Basic (in dollars per share)	$ (0.16)	$ (0.16)
Diluted (in dollars per share)	$ (0.16)	$ (0.16)
Supplemental Cash Flow Elements [Abstract]
Net (loss) income	$ (37,963)	$ (37,963)
Deferred income taxes		(13,035)
Goodwill impairment	$ 50,998	50,998
Net cash provided by (used in) operating activities		$ 0