Reconciliation between Federal Statutory Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal income tax benefit	2.50%	2.50%	2.20%
Tax effects of foreign operations	(0.10%)	(0.30%)	(0.30%)
Tax benefit from settlement of employee equity awards	(0.20%)	0.50%	(1.00%)
Other items	0.30%	0.40%	0.80%
Impact of income attributable to noncontrolling interests	0.10%	(0.20%)	(0.30%)
Effective tax rate	23.60%	23.90%	22.40%