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Summary of Significant Accounting Policies - Net Amortization Expense Related to Deferred Leasing Intangibles (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Estimated Net Increase to Rental Revenues Related to Above and Below Market Leases [Member] |
Finite-Lived Intangible Assets [Line Items] |
2013 | $ 631
2014 | 472
2015 | 455
2016 | 968
2017 | 908
Amortization of In-Place Leases and Tenant Relationships [Member] |
Finite-Lived Intangible Assets [Line Items] |
2013 | 5,584
2014 | 4,551
2015 | 3,750
2016 | 2,615
2017 | $ 2,227

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