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Business Combinations - Textual (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Apr. 30, 2015 USD ($) bed | Nov. 30, 2014 USD ($) bed | Jun. 30, 2014 USD ($) | Dec. 31, 2016 USD ($) facilities state | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) facilities state | Nov. 30, 2016 location | Oct. 31, 2016 location | Sep. 30, 2016 location | Aug. 31, 2016 bed | Jul. 31, 2016 location | May 31, 2016 location | Feb. 29, 2016 bed | Nov. 30, 2015 facilities | Oct. 31, 2015 USD ($) lease bed hospital | May 31, 2015 bed | Mar. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill |  |  |  | $ 51,400,000 | $ 806,100,000 | $ 593,100,000 |  |  |  |  |  |  |  |  |  |  |
Number of states in which acquired entity operates | state |  |  |  | 35 |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  | $ 138,300,000 | 121,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on consolidation of acquired entoty |  |  |  | 0 | 0 | 27,200,000 |  |  |  |  |  |  |  |  |  |  |
Fairlawn Rehabilitation Hospital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on consolidation of acquired entoty |  |  |  |  |  | $ 27,200,000 |  |  |  |  |  |  |  |  |  |  |
2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proforma tax rate (percent) |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill |  |  |  | $ 8,900,000 | $ 641,600,000 | $ 600,000 |  |  |  |  |  |  |  |  |  |  |
Number of Joint Venture hospitals accounted for using equity method of accounting | facilities |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which acquired entity operates | state |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] | CHI St. Vincent Hot Springs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in business acquisition (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Number of beds acquired | bed |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Inpatient Rehabilitation Segment [Member] | St. Joseph Regional Health Center (Bryan) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in business acquisition (percent) |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Number of beds acquired | bed |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] | The Bernsen Rehabilitation Center at St. John (Broken Arrow) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in business acquisition (percent) |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |
Number of beds acquired | bed |  |  |  |  |  |  |  |  |  | 24 |  |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] | Reliant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds acquired | bed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 902 |  |
Number of leases treated as capital leases | lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Number of locations | hospital |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |
Capital lease obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,000,000 |  |
Remaining minority limited partner interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |
Goodwill expected to be tax-deductible (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86.00% |  |
Proforma tax rate (percent) |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] | Quillen Rehabilitation Hospital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in business acquisition (percent) |  | 50.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds acquired | bed |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax-deductible |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in business acquisition (percent) | 83.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds acquired | bed | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax-deductible | $ 0 |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill |  |  |  | $ 42,500,000 | $ 164,500,000 | $ 592,500,000 |  |  |  |  |  |  |  |  |  |  |
Number of states in which acquired entity operates | state |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice Segment [Member] | CareSouth [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax-deductible (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |
Home Health and Hospice Segment [Member] | Encompass [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | facilities |  |  |  |  |  | 135 |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax-deductible (percent) |  |  |  |  |  | 23.00% |  |  |  |  |  |  |  |  |  |  |
Number of states in which acquired entity operates | state |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests |  |  |  |  |  | $ 64,500,000 |  |  |  |  |  |  |  |  |  |  |
Subsidiary's common stock held by subsidiary 's management (percent) |  |  |  |  |  | 16.70% |  |  |  |  |  |  |  |  |  |  |
Home Health and Hospice Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax-deductible |  |  |  |  | $ 20,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Noncompete Agreements [Member] | Home Health and Hospice Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected to be tax-deductible |  |  |  | $ 41,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Hospice [Member] | Home Health and Hospice Segment [Member] | Home Health Agency of Georgia, LLC (“Camellia”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Hospice [Member] | Home Health and Hospice Segment [Member] | Sotto International, Inc. (“Serenity”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Hospice [Member] | Home Health and Hospice Segment [Member] | Honor Hospice, LLC (“Honor”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Hospice [Member] | Home Health and Hospice Segment [Member] | CareSouth [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Home health [Member] | Home Health and Hospice Segment [Member] | Summit Home Health Care, Inc. (“Summit”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Home health [Member] | Home Health and Hospice Segment [Member] | Advantage Health Inc. (“Advantage”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Home health [Member] | Home Health and Hospice Segment [Member] | LightHouse Health Care, Inc. (“LightHouse”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Home health [Member] | Home Health and Hospice Segment [Member] | Gulf City Home Care, Inc. (“Gulf City”) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | location |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Home health [Member] | Home Health and Hospice Segment [Member] | CareSouth [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of locations | facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  |  |
Inpatient [Member] | Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds acquired | bed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 158 |
Skilled Nursing [Member] | Inpatient Rehabilitation Segment [Member] | All Other Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds acquired | bed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74 |
Corporate Joint Venture [Member] | Inpatient Rehabilitation Segment [Member] | Fairlawn Rehabilitation Hospital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in business acquisition (percent) |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in goodwill |  |  | $ 34,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest prior to acquisition (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Ownership interest after acquisition (percent) |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on consolidation of acquired entoty |  |  | $ 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Joint Venture [Member] | Home health [Member] | Home Health and Hospice Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Joint Venture hospitals accounted for using equity method of accounting | facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |

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