Income Taxes - Reconciliation of Effective Tax Rate on Income or Loss and Statutory Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory U.S. tax rate	21.00%	21.00%	21.00%
State income taxes, net of U.S. tax benefit	(4.10%)	1.60%	1.80%
Foreign income taxed at other than U.S. statutory rate	7.00%	(5.00%)	1.10%
Federal tax credits	2.80%	(3.50%)	(4.40%)
Goodwill impairment	(24.50%)	0.00%	0.00%
Other non-deductible expenses	(1.70%)	1.20%	0.70%
Non-deductible compensation	(0.70%)	1.50%	0.80%
Stock option compensation excess tax benefits	1.40%	(1.50%)	(1.00%)
Intra-entity asset transfers	0.00%	0.00%	0.80%
U.S. foreign tax inclusions	(0.40%)	0.10%	1.10%
Foreign derived intangible income deduction	1.10%	(3.20%)	(2.70%)
Impact of uncertain tax positions	(1.60%)	3.70%	0.80%
Enactment of the Tax Cuts and Jobs Act	0	0	0.003
Change in deferred tax valuation allowance	(0.70%)	0.20%	0.00%
Other	0.80%	1.20%	(0.50%)
Effective tax rate	0.40%	17.30%	19.80%