Income Taxes - Summary of Income Taxes (Federal Statutory Corporate Tax Rate) (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	21.00%	21.00%	35.00%
Foreign tax credits, net of valuation allowance	13.10%	(154.90%)	(136.10%)
Non-taxable foreign income	(27.40%)	(48.80%)	(20.10%)
Foreign tax rate differential	(10.40%)	(20.80%)	(17.00%)
Global intangible low-taxed income	10.10%	28.30%	0.00%
Change in tax rate	0.00%	0.00%	(11.80%)
Repatriation of foreign earnings	0.00%	0.00%	81.00%
Valuation allowance, other	20.60%	9.30%	5.90%
Other, net	9.20%	3.20%	4.40%
Effective income tax rate	36.20%	(162.70%)	(58.70%)