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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
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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% |  |  |  |

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