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Other Assets - Components of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Intangible assets: |  |
Total intangible assets, net | $ 129,280 | $ 47,570
Other assets: |  |
Prepaid expenses | 12,469 | 10,375
Deposits | 10,580 | 6,788
Other assets | 29,821 | 2,893
Total other assets | 182,150 | 67,626
Lease origination costs and fair market value of leases, Acquired-in-Place [Member] |  |
Intangible assets: |  |
Total intangible assets, net | 67,105 | 24,798
Tenant relations, net [Member] |  |
Intangible assets: |  |
Total intangible assets, net | $ 62,175 | $ 22,772

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