Annual report pursuant to Section 13 and 15(d)

Acquisitions and Joint Venture Activities - Additional Information (Detail)

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Acquisitions and Joint Venture Activities - Additional Information (Detail)
$ in Thousands, shares in Millions
12 Months Ended
Jan. 01, 2020
USD ($)
Apr. 01, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
Agency
agency_sold
subsidiary
Dec. 31, 2018
USD ($)
Agency
subsidiary
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Preliminary merger consideration   $ 795,400      
Payments to noncontrolling interests     $ 19,663 $ 412 $ 1,488
Number of agencies sold | agency_sold     3    
Proceeds from sale of interest     $ 4,200    
Goodwill     1,219,972 1,161,717 $ 392,601
Proceeds from sale of ownership interests       4,200  
Reduction to additional paid in capital       2,200  
Purchase of additional controlling interest       7,700  
Almost Family          
Business Acquisition [Line Items]          
Exchange ratio   91.50%      
Shares of the Company issued (in shares) | shares   12.8      
Goodwill   $ 761,886      
Home Health Agencies and Hospice Agency          
Business Acquisition [Line Items]          
Preliminary merger consideration     61,800 9,400  
Cash paid for acquisitions     57,930 8,800  
Goodwill     $ 55,842 11,000  
Acquired non-controlling interest       $ 5,000  
Home Health Agencies and Hospice Agency | Home health          
Business Acquisition [Line Items]          
Number of agencies | Agency       7  
Home Health Agencies and Hospice Agency | Hospice          
Business Acquisition [Line Items]          
Number of agencies | Agency       1  
Home Health Agencies          
Business Acquisition [Line Items]          
Number of agencies | Agency     16    
Hospice Agencies          
Business Acquisition [Line Items]          
Number of agencies | Agency     8    
Home and Community Based          
Business Acquisition [Line Items]          
Number of agencies | Agency     2    
Facility-Based          
Business Acquisition [Line Items]          
Number of agencies | Agency     1    
Trade name | Almost Family          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets   76,090      
Trade name | Home Health Agencies and Hospice Agency          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets     $ 7,403 $ 1,500  
Certificates of need/licenses | Almost Family          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets   $ 76,505      
Certificates of need/licenses | Home Health Agencies and Hospice Agency          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets     $ 7,998 $ 1,400  
Wholly owned subsidiaries          
Business Acquisition [Line Items]          
Number of subsidiaries | subsidiary       5  
Equity joint ventures          
Business Acquisition [Line Items]          
Preliminary merger consideration       $ 8,100  
Cash paid for acquisitions       $ 7,700  
Number of subsidiaries | subsidiary     4 2  
Payments to noncontrolling interests     $ 19,700    
Subsequent Event | 2020 Acquisitions          
Business Acquisition [Line Items]          
Preliminary merger consideration $ 16,400