Balance Sheet Details (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Balance Sheet Related Disclosures [Abstract]
Insurance recovery for health	$ 279	$ 0
Insurance recovery for workers’ compensation	1,271	1,403
Insurance recovery for professional liability	1,487	1,463
Insurance recovery receivable	3,037	2,866
Insurance recovery for workers’ compensation – long-term	5,857	6,281
Insurance recovery for professional liability – long-term	10,353	10,722
Non-current security deposits	925	991
Other non-current assets	17,135	17,994
Salaries and payroll taxes	15,480	11,976
Bonuses	3,915	4,584
Accrual for workers’ compensation claims	5,266	5,151
Accrual for professional liability insurance	2,433	2,516
Accrual for health care benefits	4,053	3,009
Accrual for vacation	2,096	2,166
Accrued compensation and benefits	33,243	29,402
Accrual for workers’ compensation claims	12,817	14,014
Accrual for professional liability insurance	16,053	16,056
Long-term accrued claims	28,870	30,070
Deferred compensation	1,472	1,412
Deferred rent	5,011	2,473
Long-term unrecognized tax benefits	874	819
Other	42	122
Other long-term liabilities	$ 7,399	$ 4,826