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Investments in Joint Ventures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |
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Dec. 31, 2012 Property sqft | Dec. 31, 2011 Property | Dec. 31, 2010 Property | May 26, 2012 2003 Net Lease Joint Venture [Member] Property | Feb. 13, 2012 2003 Net Lease Joint Venture [Member] Property | Dec. 31, 2012 2003 Net Lease Joint Venture [Member] Property sqft | Dec. 31, 2011 2003 Net Lease Joint Venture [Member] Property | May 26, 2011 2003 Net Lease Joint Venture [Member] | Dec. 31, 2012 2007 Europe Joint Venture [Member] Property | Dec. 31, 2012 2006 Net Lease Co-Investment Program [Member] | Mar. 21, 2006 2006 Net Lease Co-Investment Program [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  | 15.00% |  |  | 10.00% |  | 15.00%
Industrial properties owned | 714 |  |  |  |  | 5 |  |  | 0 |  |
Gross leasable area (GLA) of industrial properties owned | 63,400,000 |  |  |  |  | 2,700,000 |  |  |  |  |
Investment in Joint Venture | $ 1,012 | $ 1,674 |  |  |  | $ 1,012 |  |  |  |  |
Equity Interest Acquired |  |  |  |  | 85.00% | 85.00% | 85.00% | 85.00% |  |  |
Number of industrial properties acquired | 1 | 1 | 3 | 1 | 1 | 1 | 1 |  |  |  |
Proceeds from sale of joint venture |  |  | 5,000 |  |  |  |  |  |  | 4,541 |
Gain on Sale of Joint Venture Interests |  |  | 11,226 |  |  |  |  |  |  | 852 |
Receivables from joint ventures | 19 | 137 |  |  |  |  |  |  |  |  |
Fees received from joint ventures | $ 516 | $ 970 | $ 4,952 |  |  |  |  |  |  |  |

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