Real Estate - Summary of Acquisition (Parenthetical) (Detail) $ in Millions, BRL in Billions	1 Months Ended
	Aug. 31, 2017 USD ($) a Property	Aug. 31, 2017 BRL a Property	Sep. 30, 2017 a	Dec. 31, 2016 a
Land [Member]
Business Acquisition [Line Items]
Square feet			5,871	5,892
BRAZIL
Business Acquisition [Line Items]
Payment to acquire interest in joint venture	$ 381.7	BRL 1.2
BRAZIL | Prestabilized Properties [Member]
Business Acquisition [Line Items]
Number of buildings | Property	2	2
BRAZIL | Land [Member]
Business Acquisition [Line Items]
Square feet	531.4	531.4