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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Discussion of the facts and amounts pertaining to each failure to comply with an affirmative or negative covenant of a long-term debt instrument, including violating payment terms or an inability to meet certain minimum financial requirements or achieve or maintain certain financial ratios. The discussion would generally be expected to also include whether or not the failure can and will be overcome and a description of the terms of any waivers, including the amount of the waiver and the period of time covered by the waiver, and if reclassification of long-term debt to current has been made in the current balance sheet.

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Notes and Other Debt - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Dec. 10, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Apr. 20, 2021	Feb. 02, 2021
Debt Instrument [Line Items]
Debt instrument amount		$ 5,073,819		$ 4,965,000
Amortization of deferred financing costs		$ 4,100	$ 3,000
Maximum
Debt Instrument [Line Items]
Consolidated secured leverage ratio		500.00%
Consolidated total leverage ratio		650.00%
Maximum \| Pro Forma
Debt Instrument [Line Items]
Consolidated secured leverage ratio		400.00%
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Percentage of pay cash dividends in excess of taxable income		90.00%
CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument, debt default, description of violation or event of default		In particular, a repayment obligation could be triggered if (i) the Borrowers or certain of their subsidiaries fail to make a payment when due of any principal or interest on any other indebtedness aggregating $75.0 million or more, or (ii) an event occurs that causes, or would permit the holders of any other indebtedness aggregating $75.0 million or more to cause, such indebtedness to become due prior to its stated maturity.
Debt Instrument, debt default, amount		$ 75,000
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount	$ 560,500	$ 160,000		$ 110,000
Debt instrument, maturity date		Dec. 10, 2024		Dec. 10, 2024
Commitment fee percentage of average amount of unused commitments		0.50%
Commitment fee step-down percentage of average amount of unused commitments		0.40%
Senior Secured Revolving Credit Facility \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 160,000
7.875% Senior Secured Notes
Debt Instrument [Line Items]
Debt instrument amount		$ 2,250,000		$ 2,250,000
Issuance senior notes, stated percentage		7.875%		7.875%
Debt instrument, maturity date		Feb. 15, 2025		Feb. 15, 2025
Debt instrument, imputed interest rate		8.38%		8.38%
7.875% Senior Secured Notes \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 2,250,000
Issuance senior notes, stated percentage		7.875%
Debt instrument, maturity year		2025
Net leverage ratio		5.75%
Senior Secured Notes - 6.00% Due April 15, 2023
Debt Instrument [Line Items]
Debt instrument amount		$ 550,000		$ 550,000
Issuance senior notes, stated percentage		6.00%		6.00%
Debt instrument, maturity date		Apr. 15, 2023		Apr. 15, 2023
Debt instrument, imputed interest rate		6.49%		6.49%
Senior Secured Notes - 6.00% Due April 15, 2023 \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 550,000
Issuance senior notes, stated percentage		6.00%
Debt instrument, maturity date		Apr. 15, 2023
Senior Unsecured Notes - 7.125% Due December 15, 2024
Debt Instrument [Line Items]
Debt instrument amount		$ 600,000		$ 600,000
Issuance senior notes, stated percentage		7.125%		7.125%
Debt instrument, maturity date		Dec. 15, 2024		Dec. 15, 2024
Debt instrument, imputed interest rate		7.38%		7.38%
Senior Unsecured Notes - 7.125% Due December 15, 2024 \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 600,000
Issuance senior notes, stated percentage		7.125%
Debt instrument, maturity date		Dec. 15, 2024
Exchangeable Notes
Debt Instrument [Line Items]
Issuance senior notes, stated percentage		4.00%
Debt instrument, maturity date		Jun. 15, 2024
Exchangeable Notes \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 345,000
Issuance senior notes, stated percentage		4.00%
Debt instrument, maturity date		Jun. 15, 2024
6.50% Senior Unsecured Notes
Debt Instrument [Line Items]
Issuance senior notes, stated percentage		6.50%
Debt instrument, maturity date		Feb. 15, 2029
Debt instrument issued percent of principal amount		100.00%
Debt instrument, imputed interest rate		6.50%
6.50% Senior Unsecured Notes \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 1,110,000
Issuance senior notes, stated percentage		6.50%
Debt instrument, maturity date		Feb. 15, 2029
Senior Unsecured Notes - 6.50%, Due February 24, 2029
Debt Instrument [Line Items]
Debt instrument amount		$ 1,110,000				$ 1,110,000
Issuance senior notes, stated percentage		6.50%		6.50%
Debt instrument, maturity date		Feb. 24, 2029		Feb. 24, 2029
Debt instrument, imputed interest rate		6.83%		6.83%
Debt instrument redemption price percentage		100.00%
Debt instrument aggregate principal amount remaining outstanding		60.00%
Senior Unsecured Notes - 6.50%, Due February 24, 2029 \| Redemption on or Prior to February 15, 2024
Debt Instrument [Line Items]
Debt instrument redemption price percentage		106.50%
Debt instrument, redemption price, percentage of principal amount redeemed		40.00%
Senior Unsecured Notes - 6.50%, Due February 24, 2029 \| Redemption If Certain Changes of Control
Debt Instrument [Line Items]
Debt instrument redemption price percentage		101.00%
8.25% Senior Unsecured Notes
Debt Instrument [Line Items]
Debt instrument amount		$ 58,819		$ 1,110,000
Issuance senior notes, stated percentage		8.25%		8.25%
Debt instrument, maturity date		Oct. 15, 2023		Oct. 15, 2023
Debt issuance cost		$ 20,400
Cash interest expense for tender premium		17,600
Remaining unamortized discount and deferred finance costs		$ 1,100
Debt instrument, imputed interest rate		9.06%		9.06%
8.25% Senior Unsecured Notes \| Interest Expense
Debt Instrument [Line Items]
Loss on repayment of tendered notes		$ 38,000
8.25% Senior Unsecured Notes \| Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 58,800
Issuance senior notes, stated percentage		8.25%
Debt instrument, maturity date		Oct. 15, 2023
4.750% Senior Secured Notes due 2028 \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument amount					$ 570,000
Issuance senior notes, stated percentage					4.75%
Non-Extended Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount	$ 60,500
Debt instrument, maturity date	Apr. 24, 2022
Non-Extended Revolving Credit Facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.75%
Non-Extended Revolving Credit Facility \| Minimum \| Eurodollar
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		4.75%
Non-Extended Revolving Credit Facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		4.25%
Non-Extended Revolving Credit Facility \| Maximum \| Eurodollar
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		5.25%
Non-Extended Revolving Credit Facility \| CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 60,500
Debt instrument, maturity date		Apr. 24, 2022
Extended Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount	$ 500,000
Debt instrument, maturity date	Dec. 10, 2024
Extended Revolving Credit Facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.75%
Extended Revolving Credit Facility \| Minimum \| Eurodollar
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.75%
Extended Revolving Credit Facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.50%
Extended Revolving Credit Facility \| Maximum \| Eurodollar
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		4.50%
Extended Revolving Credit Facility \| CSL Capital, LLC
Debt Instrument [Line Items]
Debt instrument amount		$ 500,000
Debt instrument, maturity date		Dec. 10, 2024