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Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Mar. 10, 2015 | Jul. 19, 2013
Debt Disclosure [Line Items] |  |  |
Unsecured Credit Facility, current borrowing capacity |  |  | $ 625,000
Mortgage Loans Payable |  |  |
Debt Disclosure [Line Items] |  |  |
Carrying value of industrial properties held under mortgages | $ 727,751 |  |
Unsecured Credit Facility |  |  |
Debt Disclosure [Line Items] |  |  |
Unsecured Credit Facility, current borrowing capacity |  | $ 625,000 |
Unsecured Credit Facility, additional borrowing capacity | $ 900,000 |  |
Number of years Unsecured Credit Facility may be extended | 1 year |  |
Unsecured Credit Facility, interest rate description | 115 |  |
Unsecured Term Loan |  |  |
Debt Disclosure [Line Items] |  |  |
Unsecured Term Loan, face amount | $ 200,000 |  |
Interest Rate Protection Agreement |  |  |
Debt Disclosure [Line Items] |  |  |
Interest rate protection agreement, notional amount | $ 200,000 |  |

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