Unconsolidated Entities - Summary of Remaining Equity Commitments (Detail) In Millions, unless otherwise specified	Mar. 31, 2013 Prologis [Member] USD ($)	Mar. 31, 2013 Venture Partners [Member] USD ($)	Mar. 31, 2013 Prologis Targeted U.S. Logistics Fund [Member] Venture Partners [Member] USD ($)	Mar. 31, 2013 Prologis SGP Mexico [Member] Prologis [Member] USD ($)	Mar. 31, 2013 Prologis SGP Mexico [Member] Venture Partners [Member] USD ($)	Mar. 31, 2013 Prologis European Properties Fund II [Member] USD ($)	Mar. 31, 2013 Prologis European Properties Fund II [Member] EUR (€)	Mar. 31, 2013 Prologis European Properties Fund II [Member] Venture Partners [Member] USD ($)	Mar. 31, 2013 Europe Logistics Venture 1 [Member] Prologis [Member] USD ($)	Mar. 31, 2013 Europe Logistics Venture 1 [Member] Venture Partners [Member] USD ($)	Mar. 31, 2013 Prologis European Logistics Partners [Member] Prologis [Member] USD ($)	Mar. 31, 2013 Prologis European Logistics Partners [Member] Venture Partners [Member] USD ($)	Mar. 31, 2013 Prologis China Logistics Venture 1 [Member] Prologis [Member] USD ($)	Mar. 31, 2013 Prologis China Logistics Venture 1 [Member] Venture Partners [Member] USD ($)
Schedule Of Equity Method Investments Joint Ventures [Line Items]
Remaining equity commitments	$ 327.9	$ 1,034.7	$ 35.0	$ 24.6	$ 98.1	$ 38.4	€ 30.0	$ 38.4	$ 52.6	$ 298.2	$ 183.3	$ 183.3	$ 67.4	$ 381.7