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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 I - VI [Member] | Sep. 30, 2012 Tender Offer Repurchases [Member] | Mar. 29, 2012 Tender Offer Repurchases [Member] | Apr. 16, 2012 2012 Notes [Member] | Sep. 30, 2012 2028 Notes [Member] | Sep. 30, 2012 2028 Notes [Member] Senior Unsecured Debt Repurchase [Member] | Sep. 30, 2012 2017 Notes [Member] Senior Unsecured Debt Repurchase [Member] | Sep. 30, 2012 2017 Notes [Member] Senior Unsecured Debt Repurchase [Member]
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal prepayments, prohibition period |  |  |  |  | 12 months |  |  |  |  |  |  |
Percentage of outstanding balance for calculating prepayment premium |  |  |  |  | 1.00% |  |  |  |  |  |  |
Carrying value of industrial properties held under mortgage and other loan | $ 976,321 |  | $ 976,321 |  |  |  |  |  |  |  |  |
Letter of credit, amount | 537 |  | 537 |  |  |  |  |  |  |  |  |
Amount of notes paid off and retired at maturity |  |  |  |  |  |  |  | 61,829 |  |  |  |
Gain/Loss on retirement of debt | (424) | (345) | (6,646) | (4,604) |  | 6,223 |  |  |  | 1 | 424 | 424
Purchase price senior unsecured notes |  |  | 93,960 |  |  | 88,922 |  |  | 57,041 | 406 |  | 4,632
Principal amount repurchased |  |  | 91,578 |  |  | 86,925 |  |  | 55,955 | 430 |  | 4,223
Unamortized loan commitment and origination fee |  |  |  |  |  | 609 |  |  |  | 3 |  | 13
Unamortized settlement amount of interest rate protection agreements |  |  |  |  |  | 2,599 |  |  |  | 20 |  |
Maximum aggregate cash tender offer price |  |  |  |  |  |  | 100,000 |  |  |  |  |
Unamortized debt issue discount |  |  |  |  |  | 578 |  |  |  |  |  | 2
Professional Service Fee |  |  |  |  |  | $ 440 |  |  |  |  |  |

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