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Income Taxes - Reconciliation of U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. statutory rate%	21.00%	21.00%	21.00%
Change in valuation allowance	(0.30%)	(176.10%)	(10.80%)
State income taxes, net of federal benefit	2.20%	3.90%	31.20%
Share-based compensation	3.90%	(5.80%)	10.00%
International tax rate differential	8.90%	3.80%	(13.40%)
Foreign dividend income			(20.10%)
Foreign capital gain income	(7.50%)	3.20%	(7.10%)
Unremitted foreign earnings	14.50%	(2.00%)	(4.10%)
Global intangible low-taxed income			(23.00%)
Base erosion tax	33.90%	19.90%	(14.10%)
Reserve for tax contingencies	1.20%	(0.30%)	(0.40%)
Change in tax rate		(1.00%)	5.90%
Other	2.20%	4.00%	(6.30%)
Income tax provision%	80.00%	(129.40%)	(31.20%)

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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