Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Line Items]
Equity ownership interest received		$ 65.3					$ 31.2
Prologis European Logistics Partners [Member]
Supplemental Cash Flow Information [Line Items]
Assumed debt				$ 353.2
Equity ownership interest received				$ 1,300.0
Capitalization for equity based compensation expense					$ 22.7	$ 21.6	18.8
Percentage of ownership interests received				50.00%
KTR Capital Partners and Affiliates [Member]
Supplemental Cash Flow Information [Line Items]
Secured mortgage debt	$ 290.7				$ 290.7
Assumed debt	$ 170.1
FIBRA Prologis [Member]
Supplemental Cash Flow Information [Line Items]
Assumed debt			$ 345.1				$ 194.9
Equity ownership interest received			$ 609.7