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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jan. 29, 2014 Interest Rate Swap | Sep. 30, 2014 Mortgages | Jan. 29, 2014 Unsecured Term Loan | Sep. 30, 2014 Mortgages | Sep. 30, 2014 Mortgages | Sep. 30, 2014 Senior Unsecured Notes
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  |  | $ 65,558 |  | $ 81,794
Gains (losses) on extinguishment of debt | (32) | (662) | (655) | (6,248) |  |  |  |  | 655 |
Carrying value of industrial properties held under mortgage |  |  |  |  |  | 744,826 |  |  |  |
Unsecured term loan, term |  |  |  |  |  |  | 7 years |  |  |
Unsecured term loan, face amount |  |  |  |  |  |  | 200,000 |  |  |
Swaps, notional amount |  |  |  |  | $ 200,000 |  |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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