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Indebtedness - Mortgage Loans Obtained (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Property sqft
Mortgage Loans on Real Estate [Line Items] |
Loan Principal | $ 280,317
Property Carrying Value | 319,685
Mortgage Financing VII - XIV [Member] |
Mortgage Loans on Real Estate [Line Items] |
Loan Principal | 178,300
Interest Rate | 4.45%
Origination Date | May 02, 2011
Maturity Date | Jun. 01, 2018
Amortization Period | 30 years
Number of Industrial Properties Collateralizing Mortgage | 32
GLA | 5,900,000
Property Carrying Value | 206,291
Mortgage Financing XV [Member] |
Mortgage Loans on Real Estate [Line Items] |
Loan Principal | 24,417
Interest Rate | 5.579%
Origination Date | May 26, 2011
Maturity Date | Feb. 01, 2016
Amortization Period | 30 years
Number of Industrial Properties Collateralizing Mortgage | 1
GLA | 700,000
Property Carrying Value | 28,991
Mortgage Financing XVI - XXVI [Member] |
Mortgage Loans on Real Estate [Line Items] |
Loan Principal | 77,600
Interest Rate | 4.85%
Origination Date | Sep. 23, 2011
Maturity Date | Oct. 01, 2021
Amortization Period | 30 years
Number of Industrial Properties Collateralizing Mortgage | 24
GLA | 2,300,000
Property Carrying Value | 84,403
Mortgage Financing I - VI [Member] |
Mortgage Loans on Real Estate [Line Items] |
Loan Principal | 100,599
Interest Rate | 4.03%
Origination Date | Aug. 29, 2012
Maturity Date | Sep. 01, 2022
Amortization Period | 30 years
Number of Industrial Properties Collateralizing Mortgage | 31
GLA | 3,800,000
Property Carrying Value | $ 103,671

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