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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Property | Sep. 30, 2012 Property | Dec. 31, 2012 Property | Jul. 19, 2013 | Dec. 14, 2011 | Nov. 01, 2013 Subsequent Event Parcels Property
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Paid off and retired a secured mortgage loan |  |  | $ 50,565 | $ 21,468 |  |  |  | $ 31,966
Ownership interest acquired |  |  |  |  |  |  |  | 100.00%
Number of industrial properties acquired |  |  | 1 |  |  |  |  | 1
Purchase price of acquisitions | 46,463 |  | 46,463 |  |  |  |  | 26,349
Payments for repurchase of redeemable preferred stock |  |  | 150,000 | 0 |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 625,000 | 450,000 |
Line of credit facility, increase, additional borrowings |  |  | 825,000 |  |  |  |  |
Line of credit facility, interest rate description |  |  | 145 |  |  |  |  |
Number of years of extension of line of credit facility at election |  |  | 1 year |  |  |  |  |
Number of industrial properties sold |  |  | 19 | 25 | 28 |  |  | 3
Number of land parcels sold |  |  |  |  |  |  |  | 1
Proceeds from sale of industrial properties and land parcel |  |  |  |  |  |  |  | 4,644
Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements | $ (662) | $ (424) | $ (6,248) | $ (6,646) |  |  |  |

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- Definition The amount of acquisition cost of a business combination allocated to assets acquired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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