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Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense on property and equipment | $ 616,626 | $ 600,905 | $ 574,799
Capitalized interest | 17,944 | 27,322 | 25,978
Other asset impairments | $ 0 | $ 0 | 17,338
Pharmacy Business |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Other asset impairments |  |  | $ 17,338
Buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, and equipment useful lives | 25 years |  |
Buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, and equipment useful lives | 40 years |  |
Leasehold Improvements | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, and equipment useful lives | 10 years |  |
Equipment and Information Systems | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, and equipment useful lives | 3 years |  |
Equipment and Information Systems | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, and equipment useful lives | 15 years |  |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + 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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