Business Combinations - Additional Information (Detail) $ in Thousands, shares in Millions, ft² in Millions				3 Months Ended	9 Months Ended		12 Months Ended		21 Months Ended
		May. 29, 2015 USD ($) ft² Property shares	Oct. 20, 2014 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) ft² Property shares		Dec. 31, 2014 USD ($) ft² Property		Sep. 30, 2015 USD ($) ft² Property		Sep. 30, 2014 USD ($) ft² Property
Business Acquisition [Line Items]
Number of buildings | Property					1,342		1,278		1,342		1,494
Square feet | ft²					275.0		260.7		275.0		301.8
Acquisition costs incurred				$ 24,700
Rental income of properties acquired									$ 132,700
Rental expenses of properties acquired									30,000
Equity method investment	[1]				$ 4,631,000		$ 4,666,000		$ 4,631,000		$ 5,641,000
KTR Capital Partners and Affiliates [Member]
Business Acquisition [Line Items]
Contribution received from venture partner					$ 2,300,000
Business acquisition, common limited partnership units issued | shares					4.5
Total purchase price		$ 4,990,669
Prologis North American Industrial Fund [Member]
Business Acquisition [Line Items]
Parent Company's Ownership Percentage Before Acquisition							23.10%
Parent Company's Ownership Percentage After Acquisition							66.10%
Equity method investment							$ 679,000
Total purchase price			$ 46,800				$ 1,100,000
Prologis US Logistics Venture [Member]
Business Acquisition [Line Items]
Parent Company's Ownership Percentage		55.00%			55.00%	[2]	55.00%	[2]	55.00%	[2]
Contribution received from venture partner					$ 2,300,000
Prologis US Logistics Venture [Member] | KTR Capital Partners and Affiliates [Member]
Business Acquisition [Line Items]
Number of buildings | Property		315
Square feet | ft²		59.0
Area of properties under development | ft²		3.6
Area of properties to support potential build out | ft²		6.8
Prologis US Logistics Venture [Member] | KTR Capital Partners and Affiliates [Member] | Common Limited Partnership Units
Business Acquisition [Line Items]
Business acquisition, common limited partnership units issued | shares		4.5

[1] The difference between our ownership interest of a venture’s equity and our investment balance results principally from three types of transactions: (i) deferring a portion of the gains we recognize from a contribution of a property to a venture ($411.2 million and $322.9 million at September 30, 2015, and December 31, 2014, respectively); (ii) recording additional costs associated with our investment in a venture; and (iii) advances to a venture.

[2] As discussed in Note 2, USLV acquired a portfolio of properties from KTR in May 2015. We received a contribution of $2.3 billion from our venture partner to fund their share of this acquisition.