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Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 19, 2013 | Dec. 14, 2011 | Dec. 31, 2012 Mortgage Financing I - VI | Apr. 16, 2012 2012 Notes | Dec. 31, 2013 Unsecured Credit Facility | Dec. 31, 2013 Unsecured Debt | Dec. 31, 2012 Unsecured Debt | Dec. 31, 2013 Mortgages [Member] | Dec. 31, 2012 Mortgages [Member]
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal prepayments, prohibition period |  |  |  |  |  | 12 months |  |  |  |  |  |
Percentage of outstanding balance for calculating prepayment premium |  |  |  |  |  | 1.00% |  |  |  |  |  |
Mortgage loans paid off and retired prior to maturity |  |  |  |  |  |  |  |  |  |  | $ 72,261 | $ 14,112
Loss from Retirement of Debt | (6,637) | (9,684) | (5,459) |  |  |  |  |  | 5,003 | 9,323 | 1,578 | 361
Carrying value of industrial properties held under mortgage |  |  |  |  |  |  |  |  |  |  | 826,754 |
Unamortized debt issue discount |  |  |  |  |  |  |  |  | 28 | 598 |  |
Unamortized deferred financing cost, wrote off | 56 |  |  |  |  |  |  |  | 191 | 728 |  |
Unamortized settlement amount of interest rate protection agreements |  |  |  |  |  |  |  |  | 1,116 | 3,247 |  |
Professional service fee |  |  |  |  |  |  |  |  | 0 | 440 |  |
Amount of notes paid off and retired at maturity |  |  |  |  |  |  | 61,829 |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | 625,000 | 450,000 |  |  |  |  |  |  |
Line of credit facility, increase, additional borrowings |  |  |  |  |  |  |  | $ 825,000 |  |  |  |
Number of years of extension of line of credit facility at election | 1 year |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate description | 150 |  |  |  |  |  |  |  |  |  |  |

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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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