Balance Sheet Details (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Insurance recovery for health	$ 0	$ 279
Insurance recovery for workers’ compensation	1,623	1,271
Insurance recovery for professional liability	1,874	1,487
Insurance recovery receivable	3,497	3,037
Insurance recovery for workers’ compensation claims	6,093	5,857
Insurance recovery for professional liability claims	10,011	10,353
Non-current security deposits	1,095	925
Non-current income tax receivable	1,044	0
Net debt issuance costs	985	929
Other non-current assets	19,228	18,064
Salaries and payroll taxes	16,342	15,480
Bonuses	2,067	3,915
Accrual for workers’ compensation claims	5,957	5,266
Accrual for professional liability claims	2,683	2,433
Accrual for healthcare benefits	5,105	4,053
Accrual for vacation	2,117	2,096
Accrued compensation and benefits	34,271	33,243
Accrual for workers’ compensation claims	13,160	12,817
Accrual for professional liability claims	15,597	16,053
Long-term accrued claims	28,757	28,870
Deferred compensation	1,467	1,472
Deferred rent	6,875	5,011
Long-term unrecognized tax benefits	485	874
Other	344	52
Other long-term liabilities	$ 9,171	$ 7,409