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Debt Instrument Maturity Year.

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Loss on repayment of tendered notes.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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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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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Notes and Other Debt - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 15, 2021	Dec. 10, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Apr. 20, 2021	Feb. 02, 2021
Debt Instrument [Line Items]
Debt instrument amount			$ 4,970,000			$ 4,970,000		$ 4,965,000
Amortization of deferred financing costs			$ 4,100		$ 4,500	$ 8,200	$ 7,500
Maximum
Debt Instrument [Line Items]
Consolidated secured leverage ratio			5.00%			5.00%
Consolidated total leverage ratio			6.50%			6.50%
Maximum \| Pro Forma
Debt Instrument [Line Items]
Consolidated secured leverage ratio			4.00%			4.00%
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount		$ 560,500	$ 95,000			$ 95,000		$ 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%
7.875% Senior Secured Notes
Debt Instrument [Line Items]
Debt instrument amount			$ 2,250,000			$ 2,250,000		$ 2,250,000
Issuance senior notes, stated percentage			7.875%			7.875%		7.875%
Debt instrument, maturity date						Feb. 15, 2025		Feb. 15, 2025
4.75% Senior Secured Notes
Debt Instrument [Line Items]
Debt instrument amount			$ 570,000			$ 570,000
Issuance senior notes, stated percentage			4.75%			4.75%		4.75%
Debt instrument, maturity date						Apr. 15, 2028		Apr. 15, 2028
Debt instrument issued percent of principal amount						100.00%
Debt instrument redemption price percentage						100.00%
Debt instrument aggregate principal amount remaining outstanding						60.00%
4.75% Senior Secured Notes \| prior to April 15, 2024
Debt Instrument [Line Items]
Debt instrument redemption price percentage						103.00%
Debt instrument, redemption price, percentage of principal amount redeemed						10.00%
4.75% Senior Secured Notes \| Any time on or prior to April 15, 2024
Debt Instrument [Line Items]
Debt instrument redemption price percentage						104.75%
Debt instrument, redemption price, percentage of principal amount redeemed						40.00%
Senior Unsecured Notes - 7.125% Due December 15, 2024
Debt Instrument [Line Items]
Debt instrument amount			$ 600,000			$ 600,000		$ 600,000
Issuance senior notes, stated percentage			7.125%			7.125%		7.125%
Debt instrument, maturity date						Dec. 15, 2024		Dec. 15, 2024
6.50% Senior Unsecured Notes
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. 15, 2029
Debt instrument issued percent of principal amount						100.00%
Exchangeable Senior Notes - 4.00%, due June 15, 2024
Debt Instrument [Line Items]
Issuance senior notes, stated percentage			4.00%			4.00%
Debt instrument, maturity date						Jun. 15, 2024
Senior Unsecured Notes - 6.50%, Due February 24, 2029
Debt Instrument [Line Items]
Debt instrument amount										$ 1,110,000
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				$ 58,800				$ 1,110,000		$ 1,110,000
Issuance senior notes, stated percentage			8.25%			8.25%		8.25%		8.25%
Debt instrument, maturity date						Oct. 15, 2023		Oct. 15, 2023
Repayments of debt instrument	$ 58,800
Debt issuance cost				20,400
Cash interest expense for tender premium				17,600
Remaining unamortized discount and deferred finance costs	$ 1,100
8.25% Senior Unsecured Notes \| Interest Expense
Debt Instrument [Line Items]
Loss on repayment of tendered notes				$ 38,000
4.750% Senior Secured Notes due 2028
Debt Instrument [Line Items]
Debt instrument amount									$ 570,000
Issuance senior notes, stated percentage									4.75%
Debt instrument, maturity year						2028
6.00% Senior Secured Notes
Debt Instrument [Line Items]
Issuance senior notes, stated percentage			6.00%			6.00%		6.00%
Debt instrument, maturity date						Apr. 15, 2023		Apr. 15, 2023
Repayments of debt instrument						$ 550,000
Debt issuance cost			$ 1,300			$ 1,300
Cash interest expense for tender premium			3,000
6.00% Senior Secured Notes \| Interest Expense
Debt Instrument [Line Items]
Loss on repayment of tendered notes			4,300
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 \| 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 \| 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%
Extended Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount		$ 500,000
Debt instrument, maturity date		Dec. 10, 2024
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 \| 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%
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%
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC \| Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount			95,000			$ 95,000
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC \| 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 year						2025
Net leverage ratio						5.75%
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC \| 4.75% Senior Secured Notes
Debt Instrument [Line Items]
Debt instrument amount			$ 570,000			$ 570,000
Issuance senior notes, stated percentage			4.75%			4.75%
Debt instrument, maturity year						2028
Debt instrument redemption price percentage						101.00%
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC \| 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
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC \| 6.50% Senior Unsecured Notes
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. 15, 2029
Uniti Group LP, Uniti Group Finance 2019 Inc. and CSL Capital, LLC \| Exchangeable Senior Notes - 4.00%, due June 15, 2024
Debt Instrument [Line Items]
Debt instrument amount			$ 345,000			$ 345,000
Issuance senior notes, stated percentage			4.00%			4.00%
Debt instrument, maturity date						Jun. 15, 2024
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			$ 75,000
CSL Capital, LLC \| Non Extended Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount			60,500			$ 60,500
Debt instrument, maturity date						Apr. 24, 2022
CSL Capital, LLC \| Extended Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument amount			$ 500,000			$ 500,000
Debt instrument, maturity date						Dec. 10, 2024