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Long-Term Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Feb. 13, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate fair value $ 23.1        
Assumed risk free interest rate 0.67%        
Expected volatility rate 46.00%        
Compensation expense   6.9 5.0 20.8 18.0
Prologis Promote Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total value of awards   11.3   11.3  
Total value of awards, paid in cash   4.2      
Restricted Stock Units (RSUs) [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Restricted Stock Units (RSUs) [Member] | Prologis Promote Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of share options issued   57,000      
Aggregate fair value   2.4      
Vesting period   3 years      
Limited Partnership Units [Member] | Prologis Promote Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of share options issued   113,000      
Aggregate fair value   $ 4.7      
Vesting period   3 years      
Peer Company [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected volatility rate 30.00%