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Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 11, 2015 | Jan. 29, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 10, 2015 | Jul. 19, 2013
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Loss from Retirement of Debt |  |  | $ 0 | $ (655) | $ (6,637) |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  | $ 625,000
2014 Notes |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 81,794 |  |  |
2014 Unsecured Term Loan |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Unsecured Term Loan, Term |  | 7 years |  |  |  |  |
Unsecured Term Loan, Face Amount |  | $ 200,000 |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  | LIBOR plus 170 basis points |  |  |  |
2015 Unsecured Term Loan |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Unsecured Term Loan, Term | 7 years |  |  |  |  |  |
Unsecured Term Loan, Face Amount | $ 260,000 |  |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  | LIBOR plus 160 basis points |  |  |  |
Mortgages |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 22,910 | 65,558 |  |  |
Loss from Retirement of Debt |  |  | 0 | $ 655 |  |  |
Carrying value of industrial properties held under mortgage |  |  | 727,022 |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 625,000 |
Line of credit facility, increase, additional borrowings |  |  | $ 900,000 |  |  |  |
Number of years of extension of line of credit facility at election |  |  | 1 year |  |  |  |
Line of credit facility, interest rate description |  |  | LIBOR plus 115 basis points |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |  |
Swaps, Notional Amount |  |  | $ 460,000 |  |  |  |

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