Income Taxes - Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	21.00%	21.00%	21.00%
Increase (decrease) resulting from:
Change in valuation allowance	(0.40%)	11.50%	(6.60%)
Effect of different tax rates of foreign jurisdictions	(4.70%)	(24.80%)	(6.60%)
Audit settlements and statute expirations	3.90%	0.60%	(1.10%)
US tax reform items	2.50%	4.30%	10.80%
Research and development credits	(1.40%)	(2.30%)	(2.50%)
Non-deductible expenses	2.10%	2.10%	3.40%
Foreign, state and local tax, net of Federal benefit	1.40%	1.70%	1.80%
Tax effects of intercompany transfers	1.40%	1.50%	0.80%
Undistributed profit of subsidiaries	0.90%	1.20%	1.20%
Other	0.10%	0.60%	5.70%
Effective rate	26.80%	17.40%	27.90%