Details of Certain Balance Sheet Accounts - Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Details Of Certain Balance Sheet Accounts [Abstract]
Health insurance	$ 10,600	$ 11,700
Workers' compensation	26,800	23,900
Legal and other settlements	5,700	10,500
Lease liability	400	600
Charity care	1,400	700
Estimated Medicare CAP liability	800	1,400
Hospice cost of revenue	7,200	6,800
OIG self-disclsoure accrual	0	4,700
Patient liability	4,300	5,100
Other	6,100	6,600
Accrued expenses	$ 63,290	$ 71,965