Summary of Activity Related to Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Goodwill and Intangible Assets [Line Items] |
|
|
|
| Beginning balance |
$ 33,193
|
$ 36,700
|
$ 47,000
|
| Additions |
11,100
|
0
|
600
|
| Write-off |
(300)
|
(200)
|
(1,100)
|
| Other intangibles impairment charge |
0
|
(3,100)
|
(8,200)
|
| Amortization |
0
|
(200)
|
(1,600)
|
| Ending balance |
44,047
|
33,193
|
36,700
|
| NonCompete Agreements Reacquired Franchise Rights [Member] |
|
|
|
| Goodwill and Intangible Assets [Line Items] |
|
|
|
| Beginning balance |
0
|
200
|
1,800
|
| Additions |
5,900
|
0
|
0
|
| Write-off |
0
|
0
|
0
|
| Other intangibles impairment charge |
0
|
0
|
0
|
| Amortization |
0
|
(200)
|
(1,600)
|
| Ending balance |
5,900
|
0
|
200
|
| Certificates Of Need And Licenses [Member] |
|
|
|
| Goodwill and Intangible Assets [Line Items] |
|
|
|
| Beginning balance |
23,100
|
25,400
|
33,700
|
| Additions |
1,100
|
0
|
600
|
| Write-off |
(300)
|
(200)
|
(1,100)
|
| Other intangibles impairment charge |
0
|
(2,100)
|
(7,800)
|
| Amortization |
0
|
0
|
0
|
| Ending balance |
23,900
|
23,100
|
25,400
|
| Acquired Names Of Business [Member] |
|
|
|
| Goodwill and Intangible Assets [Line Items] |
|
|
|
| Beginning balance |
10,100
|
11,100
|
11,500
|
| Additions |
4,100
|
0
|
0
|
| Write-off |
0
|
0
|
0
|
| Other intangibles impairment charge |
0
|
(1,000)
|
(400)
|
| Amortization |
0
|
0
|
0
|
| Ending balance |
$ 14,200
|
$ 10,100
|
$ 11,100
|