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Indebtedness - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
sqft
Dec. 31, 2010
Sep. 20, 2011
sqft
Dec. 31, 2012
Mortgage Financing Debt Instrument One To Fourteen [Member]
Dec. 31, 2012
Mortgage Financing XVI - XXVI [Member]
Dec. 31, 2012
Mortgage Financing XV [Member]
Sep. 15, 2011
4.625% Notes due 2011 [Member]
Dec. 31, 2012
2012 Notes [Member]
Apr. 16, 2012
2012 Notes [Member]
Dec. 31, 2012
Unsecured Credit Facility [Member]
Dec. 31, 2012
Mortgage Loans Payable [Member]
Dec. 31, 2011
Mortgage Loans Payable [Member]
Dec. 31, 2012
Senior Unsecured Notes [Member]
Dec. 31, 2011
Senior Unsecured Notes [Member]
Debt Disclosure [Line Items]                              
Principal prepayments, prohibition period         12 months 12 months 3 months                
Percentage of outstanding balance for calculating prepayment premium         1.00% 1.00% 1.00%                
Mortgage loans paid off and retired $ 14,112 $ 62,662                          
Loss from early retirement of debt (9,684) (5,459) (4,304)                 361 2,128 9,323 2,012
Gross leasable area (GLA) of industrial property transferred to lender   400,000   400,000                      
Escrow balance       1,845                      
Non-recourse mortgage loan       5,040                      
Loss from retirement of debt   147                          
Carrying value of industrial properties held under mortgage and other loan 949,557                            
Repurchase price senior unsecured notes 110,613 110,667                       110,613 110,667
Principal amount of senior notes repurchased                           106,303 112,757
Unamortized debt issue discount                           598 135
Unamortized loan fees 728 717                          
Unamortized settlement amount of interest rate protection agreements 3,247 3,250                          
Professional service fee 440 0                          
Amount of notes paid off and retired at maturity               128,900   61,829          
Amount of Unsecured Revolving Credit Agreement 450,000                            
Increase in borrowing capacity under Unsecured Credit Facility                     500,000        
Unamortized deferred financing cost, wrote off $ 1,172                            
Unsecured credit facility maturity date           Oct. 01, 2021 Feb. 01, 2016   Apr. 12, 2012   Dec. 12, 2014        
LIBOR interest rate description                     LIBOR plus 170 basis points or at a base rate plus 170 basis points        
Weighted average interest rate                     1.912%