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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2020 USD ($) | Mar. 26, 2020 USD ($) | Mar. 13, 2020 USD ($) | May 01, 2019 USD ($) | Jul. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | May 01, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) trust segment | Dec. 31, 2018 USD ($) | Nov. 22, 2019 | Aug. 07, 2019 | Apr. 30, 2019 USD ($) | Jun. 14, 2018 USD ($) | Dec. 31, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | $ 5,765,416,000 | $ 5,765,416,000 | $ 6,016,930,000 |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | 400,300,000 | 400,300,000 | $ 720,662,000 |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  | $ 1,200,000,000 |  |  |  | $ 1,224,374,000 |  |  |  |  |  |
Number of trusts of which the Company is the beneficiary | trust |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Nonamortizable intangible assets |  |  |  | $ 2,195,984,000 |  |  | $ 2,195,984,000 |  |  |  |  |  |  |  |  |
Noncash impairment charge of other investments |  |  |  |  |  |  | 8,300,000 | 21,000,000.0 |  | $ 900,000 | $ 14,200,000 |  |  |  |  |
Advertising expenses |  |  |  |  |  |  | 59,600,000 |  | 126,000,000.0 | 167,200,000 | 201,200,000 |  |  |  |  |
Advertising expense, barter costs |  |  |  |  |  |  | 46,000,000.0 |  | 105,000,000.0 | 133,000,000.0 | 155,200,000 |  |  |  |  |
Total member's equity (deficit) |  |  |  | 2,779,115,000 |  |  | 2,779,115,000 | 2,945,441,000 | 2,945,441,000 | 1,050,817,000 | (11,560,342,000) |  |  |  |  | $ (11,344,344,000)
Credit loss reserve against available-for-sale debt securities |  |  |  |  |  |  |  |  |  | 5,600,000 |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total member's equity (deficit) |  |  |  | 0 |  |  | 0 | 112,548,000 | 112,548,000 | $ (1,803,620,000) | (13,345,346,000) |  |  |  |  | $ (13,142,001,000)
Adoption of ASC 842, Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total member's equity (deficit) |  |  |  |  |  |  |  |  |  |  | 128,908,000 |  |  |  |  |
Adoption of ASC 842, Leases | Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total member's equity (deficit) |  |  |  |  |  |  |  | 1,500,000 | 1,500,000 |  | $ 128,908,000 |  |  |  |  |
International Outdoor Advertising |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  | 3,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  |  |  |  |  |  |  |  | The Company’s media representation contracts typically have terms up to ten years in duration and are generally billed monthly upon satisfaction of the performance obligations |  |  |  |  |  |
Minimum | Buildings and improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Minimum | Towers, transmitters and studio equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Minimum | Furniture and other equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Maximum | Buildings and improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  |  |  |  | 39 years |  |  |  |  |  |
Maximum | Towers, transmitters and studio equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
Maximum | Furniture and other equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Licensing Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  |  | $ 502,700,000 | 91,400,000 |  |  |  |  |  |  |  |  |
Nonamortizable intangible assets |  |  |  | 2,281,720,000 |  |  | 2,281,720,000 |  |  |  |  |  |  |  |  |
iHeartCommunications, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 5,800,000,000 |  |  | 5,800,000,000 |  |  |  |  |  |  | $ 16,000,000,000 |  |
Asset-based Revolving Credit Facility Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  |  |  | $ 235,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility Due 2023 | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit | $ 235,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan B | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Asset-based Revolving Credit Facility Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | 450,000,000.0 |  |  |  |  |  |
Outstanding borrowings under facility |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  | 32,900,000 |  |  |  |  |  |
Borrowing base availability |  |  |  |  |  |  |  |  |  | 417,100,000 |  |  |  |  |  |
Line of credit, amount available to be drawn |  |  |  |  |  |  |  |  |  | 172,000,000 |  |  |  |  |  |
Line of Credit | Asset-based Revolving Credit Facility Due 2023 | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Draws on credit facilities |  | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  | 4,322,263,000 | 4,322,263,000 | 4,600,762,000 |  |  |  |  |  |
Secured Debt | iHeartCommunications, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | 3,500,000,000 |  |  | 3,500,000,000 |  |  |  |  |  |  |  |  |
Secured Debt | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of term loan |  |  |  |  | $ 450,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Secured Debt | 8.375% Senior Unsecured Notes due 2027 | iHeartCommunications, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,450,000,000 |  |  | $ 1,450,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 8.375% |  |  | 8.375% |  |  |  |  |  |  |  |  |
Secured Debt | 6.375% Senior Secured Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 800,000,000 |  |  | $ 800,000,000 | 800,000,000 | 800,000,000 | 800,000,000 |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 800,000,000 |  |  | $ 800,000,000 |  |  | $ 800,000,000.0 |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 6.375% |  |  | 6.375% |  |  | 6.375% |  | 6.375% | 6.375% |  |  |
Secured Debt | 6.375% Senior Secured Notes due 2026 | iHeartCommunications, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 800,000,000 |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 6.375% |  |  | 6.375% |  |  |  |  |  |  |  |  |
Secured Debt | Asset-based Revolving Credit Facility Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 |  |  | $ 0 | 0 | 0 | $ 0 |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due 2026 | iHeartCommunications, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 6.375% |  |  | 6.375% |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | iHeartCommunications, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 450,000,000 |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Asset-based Revolving Credit Facility Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 450,000,000 | $ 450,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Asset-based Revolving Credit Facility Due 2023 | Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 450,000,000.0 |  |  | $ 450,000,000.0 |  |  |  |  |  |  |  | $ 450,000,000.0 |
Borrowing base availability | $ 190,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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- Definition The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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