Income Taxes - Tax Effects of Temporary Differences That Rises to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 1,202	$ 1,249
Allowance for doubtful accounts	3,613	3,288
Employee benefits and compensation	33,549	30,151
Lease costs	5,726	6,291
State tax credit carryforwards	189	1,291
Deferral of employer FICA taxes	1,961	3,983
Other deferred tax assets	589	424
Total gross deferred tax assets	46,829	46,677
Less: valuation allowance	(2,046)	(2,663)
Total deferred tax assets, net	44,783	44,014
Deferred tax liabilities:
Client list intangible assets	250	524
Goodwill and other intangibles	57,740	49,680
Property and equipment	1,488	2,071
Other deferred tax liabilities	745	491
Total gross deferred tax liabilities	60,223	52,766
Deferred income taxes, net	$ (15,440)	$ (8,752)