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Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 11, 2015 | Sep. 30, 2015 | Mar. 10, 2015 | Jul. 19, 2013
Debt Disclosure [Line Items] |  |  |  |
Interest rate protection agreement, notional amount | $ 260,000 |  |  |
Unsecured Term Loan, term | 7 years |  |  |
Unsecured Term Loan, face amount | $ 260,000 |  |  |
Unsecured Credit Facility, current borrowing capacity |  |  |  | $ 625,000
Mortgage Loans Payable |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Carrying value of industrial properties held under mortgages |  | $ 722,430 |  |
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 |  | LIBOR plus 115 basis points |  |
Interest Rate Protection Agreement |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rate protection agreement, notional amount |  | $ 460,000 |  |

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