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Income Taxes - Summary of Income Taxes (Federal Statutory Corporate Tax Rate) (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	21.00%	21.00%	21.00%
Foreign tax credits, net of valuation allowance	(31.80%)	13.10%	(154.90%)
Non-taxable foreign income	(2.20%)	(27.40%)	(48.80%)
Foreign tax rate differential	(5.30%)	(10.40%)	(20.80%)
Global intangible low-taxed income	0.00%	10.10%	28.30%
Valuation allowance, other	(11.10%)	20.60%	9.30%
Other, net	(2.60%)	9.20%	3.20%
Effective income tax rate	(32.00%)	36.20%	(162.70%)

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- Definition

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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