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Goodwill and Other Intangibles, Net - Schedule of Changes in Goodwill by Segment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Balance at beginning of period $ 307,317 $ 290,694
Goodwill from acquisitions 52,003 16,561
Goodwill related to noncontrolling interests 34,409 1,275
Goodwill related to impairment on disposals   (1,213)
Goodwill related to prior period net working capital adjustments (1,470)  
Goodwill related to prior year adjustments 342  
Balance at end of period 392,601 307,317
Home Health Reporting Unit [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 210,839 202,995
Goodwill from acquisitions 30,623 6,760
Goodwill related to noncontrolling interests 21,469 580
Goodwill related to impairment on disposals   504
Goodwill related to prior period net working capital adjustments (1,470)  
Goodwill related to prior year adjustments (5)  
Balance at end of period 261,456 210,839
Hospice Reporting Unit [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 64,234 58,136
Goodwill from acquisitions 15,000 7,460
Goodwill related to noncontrolling interests 9,580 355
Goodwill related to impairment on disposals   (1,717)
Goodwill related to prior period net working capital adjustments 0  
Goodwill related to prior year adjustments 0  
Balance at end of period 88,814 64,234
Community Based Reporting Unit [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 18,820 17,972
Goodwill from acquisitions 6,220 848
Goodwill related to noncontrolling interests 3,501 0
Goodwill related to impairment on disposals   0
Goodwill related to prior year adjustments 0  
Balance at end of period 28,541 18,820
Facility Based Reporting Unit [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 13,424 11,591
Goodwill from acquisitions 160 1,493
Goodwill related to noncontrolling interests (141) 340
Goodwill related to prior year adjustments 347  
Balance at end of period $ 13,790 $ 13,424