Business Combinations - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Oct. 20, 2014	Dec. 31, 2014		Mar. 31, 2015		Mar. 31, 2014
Business Acquisition [Line Items]
Equity method investment		$ 4,666,000,000	[1]	4,382,000,000	[1]	4,513,000,000	[1]
Prologis North American Industrial Fund [Member]
Business Acquisition [Line Items]
Parent Company's Ownership Percentage		66.10%		66.10%		23.10%
Equity method investment		679,000,000
Total purchase price	$ 46,800,000	$ 1,082,520,000

[1] The difference between our ownership interest of the 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 the venture; (ii) recording additional costs associated with our investment in the venture; and (iii) advances to the venture.