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SUMMARY OF ACCOUNTING POLICIES (Details Narrative) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2019 USD ($) | Jan. 01, 2019 USD ($) | Apr. 12, 2018 USD ($) | Mar. 01, 2018 USD ($) | Feb. 01, 2018 USD ($) shares | Sep. 30, 2019 USD ($) shares | Nov. 06, 2014 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) joint_venture | Jun. 30, 2019 USD ($) | Apr. 01, 2017 | Mar. 24, 2017 USD ($) | Oct. 06, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contracts receivable, factored amount |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |
Contracts receivable, factoring receivable |  |  |  |  |  | $ 24,300,000 |  | $ 24,300,000 |  | 24,300,000 |  |  |  |  |  |
Deferred financing costs, net of accumulated amortization |  |  |  |  |  | 1,700,000 |  | 1,700,000 |  | 1,700,000 |  | $ 1,400,000 |  |  |  |
Deferred financing costs, net, period increase |  |  |  |  |  |  |  |  |  | 683,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  | 439,867,000 |  | 439,867,000 |  | 439,867,000 |  | 418,093,000 |  |  |  |
Indefinite-lived intangible assets |  |  |  |  |  | 11,900,000 |  | 11,900,000 |  | 11,900,000 |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |  |
Goodwill, impairment loss |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |
Indefinite-lived trade names |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Income tax expense |  |  |  |  |  |  |  | $ 1,816,000 | $ 2,827,000 | $ 3,556,000 | $ 2,835,000 |  |  |  |  |
Effective tax rate |  |  |  |  |  |  |  | 26.30% | 32.90% | 24.80% | 29.50% |  |  |  |  |
Total credit facilities outstanding |  |  |  |  |  | 0 |  | $ 0 |  | $ 0 |  |  |  |  |  |
Investment at cost |  |  |  |  |  | 30,421,000 |  | 30,421,000 |  | 30,421,000 |  | 30,030,000 |  |  |  |
Aggregate cost |  |  |  |  |  | 65,469,000 |  | 65,469,000 |  | 65,469,000 |  | $ 65,031,000 |  |  |  |
Number of unconsolidated joint ventures | joint_venture |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Loss on economic interest transaction |  |  |  |  |  |  |  |  |  | (134,000) |  |  |  |  |  |
Management service fees |  |  |  |  |  |  |  | 2,500,000 | $ 3,500,000 | $ 7,800,000 | $ 10,600,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Medic Vision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 14.21% |  |  |  |  |  |  |  |  |  |  | 12.50% |
Investment at cost |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |
Option to purchase additional equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |
Additional equity interest acquired |  |  |  | 1.96% |  |  |  |  |  |  |  |  |  |  |  |
Initial qwnership percentage after dilution |  |  |  | 12.25% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  | $ 1,200,000 |  | $ 1,200,000 |  | $ 1,200,000 |  |  |  |  |  |
Turner Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased (in shares) | shares |  |  |  |  | 2,100,000.0 |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased, value |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Restated Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  | 14,000,000 |  | 14,000,000 |  | 14,000,000 |  |  |  |  |  |
Restated Plan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Restated Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
2016 Caps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium liability for 2016 Caps |  |  |  |  |  | $ 5,300,000 |  | $ 5,300,000 |  | $ 5,300,000 |  |  |  |  |  |
2016 Caps | September 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  | 150,000,000 |  | 150,000,000 |  | 150,000,000 |  |  |  |  |  |
2016 Caps | October 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |  |
2019 SWAPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
2019 SWAPS | October 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
2019 SWAPS | October 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |
Property and equipment, net | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Property and equipment, net | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Leasehold Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Leasehold Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
2016 Caps | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 2.00% |  | 2.00% |  | 2.00% |  |  |  |  |  |
2019 SWAPS - Interest Rate Contracts | 2019 SWAPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
2019 SWAPS - Interest Rate Contracts | 2019 SWAPS1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |
2019 SWAPS - Interest Rate Contracts | London Interbank Offered Rate (LIBOR) | 2019 SWAPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.96% |  |  |
2019 SWAPS - Interest Rate Contracts | London Interbank Offered Rate (LIBOR) | 2019 SWAPS1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.05% |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs, net of accumulated amortization |  |  |  |  |  | $ 1,700,000 |  | $ 1,700,000 |  | $ 1,700,000 |  |  |  |  |  |
Total credit facilities outstanding |  |  |  |  |  | 0 |  | 0 |  | 0 |  | $ 28,000,000 |  |  |  |
RadNet | Santa Monica Imaging Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |
Loss on economic interest transaction |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cedars Sinai Medical Center | Santa Monica Imaging Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |
Additional equity interest acquired |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment owned, value |  | $ 134,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dignity Health | Glendale Advanced Imaging | Joint Venture | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |
Dignity Health | Glendale Advanced Imaging | Joint Venture | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |
Promissory Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note |  |  |  |  |  | 0 |  | $ 0 |  | $ 0 |  | $ 199,000 |  |  |  |
Promissory Note | Turner Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note |  | $ 143,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Attorney's Office For The Western District of New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |  |  |
Settled Litigation | US Attorney's Office For The Western District of New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement amount |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |
Garden State Radiology Network, LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 888,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%
Loss on economic interest transaction | 114,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |  |
Nulogix, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 75.00% |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on economic interest transaction | $ 504,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 1,500,000 |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Jefferson Health |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00%

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
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