Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowance for uncollectible accounts	$ 8,394	$ 8,065
Accrued employee benefits	7,533	8,247
Stock compensation	2,735	2,373
Accrued self-insurance	6,626	6,596
Acquisition costs	2,631	1,635
Net operating loss carry forward	5,245	6,084
Intangible asset impairment	6	10
Lease payable	23,220	25,667
Government stimulus advance	21,591	19,114
Payroll tax	5,895	11,750
Other	312	285
Gross deferred tax assets	84,188	89,826
Less: valuation allowance	(3,121)	(3,876)
Net deferred tax assets	81,067	85,950
Deferred tax liabilities:
Amortization of intangible assets	(100,339)	(85,826)
Tax depreciation in excess of book depreciation	(17,584)	(14,065)
Prepaid expenses	(1,733)	(1,538)
Non-accrual experience accounting method	(829)	(743)
Right of use asset	(22,781)	(25,202)
Other	(7,827)	(5,813)
Deferred tax liabilities	(151,093)	(133,187)
Net deferred tax liability	$ (70,026)	$ (47,237)