Income Taxes - Principal Reasons for the Difference Between the Effective Tax Rate and UBT Statutory Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
UBT statutory rate	$ 48,659	$ 36,297	$ 32,937
Corporate subsidiaries' federal, state, and local	1,322	2,025	4,000
Foreign subsidiaries taxed at different rates	43,019	33,969	26,719
FIN 48 reserve (release)	0	(1,886)	2,765
UBT business allocation percentage rate change	23	8	(79)
Deferred tax and payable write-offs	1,003	(887)	314
Foreign outside basis difference	1,492	3	155
Amended 2017 return	0	(221)	(3,853)
Effect of ASC 740 adjustments, miscellaneous taxes, and other	1,799	2,654	2,305
Income not taxable resulting from use of UBT business apportionment factors and effect of compensation charge	(34,589)	(26,309)	(23,509)
Income tax expense	$ 62,728	$ 45,653	$ 41,754
Effective Income Tax Rate Reconciliation, Percent [Abstract]
UBT statutory rate, percent	4.00%	4.00%	4.00%
Corporate subsidiaries' federal, state, and local, percent	0.20%	0.20%	0.50%
Foreign subsidiaries taxed at different rates, percent	3.50%	3.70%	3.30%
FIN 48 release, percent	0.00%	(0.20%)	0.30%
UBT Bap Rate Change, percent	0.00%	0.00%	0.00%
Deferred tax and payable write-offs, percent	0.10%	(0.10%)	0.00%
Foreign outside basis difference, percent	0.10%	0.00%	0.00%
Amended 2017 return, percent	0.00%	0.00%	(0.50%)
Effect of ASC 740 adjustments, miscellaneous taxes, and other, percent	0.10%	0.30%	0.30%
Income not taxable resulting from use of UBT business apportionment factors and effect of compensation charge, percent	(2.80%)	(2.90%)	(2.80%)
Effective tax rate, percent	5.20%	5.00%	5.10%