Real Estate - Summary of Acquisition (Parenthetical) (Detail) $ in Millions, R$ in Billions	1 Months Ended
	Aug. 31, 2017 USD ($) a Property	Aug. 31, 2017 BRL (R$) a Property	Sep. 30, 2018 a	Dec. 31, 2017 a	Sep. 30, 2017 a
Land [Member]
Business Acquisition [Line Items]
Square feet			5,228	5,191
BRAZIL
Business Acquisition [Line Items]
Payment to acquire interest in joint venture	$ 381.7	R$ 1.2
BRAZIL | Land [Member]
Business Acquisition [Line Items]
Square feet	531	531
BRAZIL | Prestabilized Properties [Member]
Business Acquisition [Line Items]
Number of buildings | Property	2	2
Acquisitions of Properties from Third Parties [Member] | Land [Member]
Business Acquisition [Line Items]
Square feet			974		1,201