Summary of Activity Related to Goodwill (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Goodwill and Intangible Assets [Line Items] | |||
| Beginning balance | $ 205,587 | $ 208,900 | $ 209,600 |
| Additions | 56,100 | 0 | 1,000 |
| Goodwill, Written off Related to Sale of Business Unit | 0 | (3,300) | (400) |
| Goodwill, Impairment Loss | 0 | (1,300) | |
| Ending balance | 261,663 | 205,587 | 208,900 |
| Home Health [Member] | |||
| Goodwill and Intangible Assets [Line Items] | |||
| Beginning balance | 16,500 | 16,600 | 18,200 |
| Additions | 50,600 | 0 | 100 |
| Goodwill, Written off Related to Sale of Business Unit | 0 | (100) | (400) |
| Goodwill, Impairment Loss | 0 | (1,300) | |
| Ending balance | 67,100 | 16,500 | 16,600 |
| Hospice [Member] | |||
| Goodwill and Intangible Assets [Line Items] | |||
| Beginning balance | 189,100 | 192,300 | 191,400 |
| Additions | 5,500 | 0 | 900 |
| Goodwill, Written off Related to Sale of Business Unit | 0 | (3,200) | 0 |
| Goodwill, Impairment Loss | 0 | 0 | |
| Ending balance | $ 194,600 | $ 189,100 | $ 192,300 |