Debt - Debt Summary (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.50%	1.60%
Debt	$ 18,368,538	$ 17,715,054
Percentage of outstanding debt	100.00%	100.00%
GBP
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.10%	2.10%
Debt	$ 1,340,388	$ 1,376,807
Percentage of outstanding debt	7.30%	7.80%
CAD
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.90%	2.70%
Debt	$ 287,413	$ 283,773
Percentage of outstanding debt	1.60%	1.60%
EUR
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.00%	1.00%
Debt	$ 8,579,524	$ 7,408,407
Percentage of outstanding debt	46.70%	41.80%
JPY
Debt Instrument [Line Items]
Weighted Average Interest Rate	0.90%	0.90%
Debt	$ 2,721,840	$ 2,878,542
Percentage of outstanding debt	14.80%	16.20%
USD
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.50%	2.60%
Debt	$ 5,439,373	$ 5,767,525
Percentage of outstanding debt	29.60%	32.60%