Financial Instruments and Fair Value Measurements - Derivative Activity (Parenthetical) (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended				3 Months Ended
	Sep. 30, 2014 USD ($) Option	Sep. 30, 2014 USD ($) Option	Sep. 30, 2013 USD ($) Contract	Sep. 30, 2013 Prologis European Logistics Partners [Member] USD ($) Contract	Sep. 30, 2013 Nippon Prologis REIT Inc [Member] USD ($) Contract	Sep. 30, 2014 Yen Term Loan [Member] JPY (¥) Contract
Derivative [Line Items]
Number of option exercised	1	2
Net gain from option exercised	$ 1.0	$ 1.1
Number of contracts						2
Notional value of swap contracts settled			$ 319.9	$ 383.9	$ 526.4	¥ 40,900.0
Number of swap contracts			12		5
Notional value of swap contracts contributed				13