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Income Taxes - Reconciliation of the Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate	21.00%	21.00%	21.00%
Increase (decrease) in tax resulting from:
State tax provision, net of federal benefit	3.80%	2.60%	8.30%
Foreign tax rate differential	(0.40%)	0.20%	(0.40%)
Stock option compensation	0.40%	(5.70%)	(1.20%)
Withholding taxes	1.30%	(3.30%)	3.50%
Non-deductible expenses	0.00%	(2.20%)	9.80%
Change in valuation allowance	(0.00%)	5.80%	2.30%
Foreign subsidiary income subject to U.S. tax	(0.50%)	(4.30%)	(7.40%)
Change in tax legislation	(0.003)	(0.019)	(0.0012)
Audit settlements	0.00%	(0.00%)	(8.30%)
Other, net	0.60%	(0.20%)	(0.30%)
Effective tax rate	25.10%	22.80%	0.30%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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