Unconsolidated Entities - Summary of Remaining Equity Commitments (Parenthetical) (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended
	Jun. 30, 2012 Prologis Targeted U.S. Logistics Fund [Member] USD ($)	Sep. 30, 2012 Prologis Targeted U.S. Logistics Fund [Member] USD ($)	Sep. 30, 2012 Prologis Europe Logistics Fund [Member] USD ($) Buildings	Sep. 30, 2012 Prologis Europe Logistics Fund [Member] EUR (€)	Mar. 31, 2012 Prologis Europe Logistics Fund [Member] USD ($) Property Buildings	Mar. 31, 2012 Prologis Europe Logistics Fund [Member] EUR (€)
Schedule Of Equity Method Investments Joint Ventures [Line Items]
Commitments from third parties, Secured	$ 183.0	$ 265.5
Equity method investment contribution			32.2	25.0	17.2	13.0
Equity method investment partner contribution			$ 4.8	€ 3.8	$ 2.6	€ 2.0
Number of buildings acquired by co-investment venture			1	1	2	2
Number of properties contributed to venture					1	1