Business Combinations - Schedule of Consideration Transferred for Business Combination (Detail) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	May 31, 2011	Jun. 30, 2011 USD ($)	Jun. 30, 2011 EUR (€)	Dec. 31, 2012	Dec. 31, 2011	Jun. 02, 2011 USD ($)
Business Acquisition [Line Items]
ProLogis shares and limited partnership units outstanding at June 2, 2011 (60% of total shares of the combined company)				461,770,000	459,401,000	571,400,000
Total shares of the combined company (for accounting purposes)						952,300,000
Number of AMB shares to be issued (40% of total shares of the combined company)	96,500,000	380,900,000	380,900,000
Multiplied by price of ProLogis common share on June 2, 2011						$ 15.21
Consideration associated with common shares issued						$ 5,794.1
Add consideration associated with share based payment awards						62.4
Total consideration of the Operating Partnership		$ 1,600.0	€ 1,100.0			$ 5,856.5