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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2005
Dec. 31, 2012
Amortization of In-Place Leases and Tenant Relationships [Member]
Dec. 31, 2011
Amortization of In-Place Leases and Tenant Relationships [Member]
Dec. 31, 2010
Amortization of In-Place Leases and Tenant Relationships [Member]
Dec. 31, 2012
Amortization of Above and Below Market Leases [Member]
Dec. 31, 2011
Amortization of Above and Below Market Leases [Member]
Dec. 31, 2010
Amortization of Above and Below Market Leases [Member]
Summary Of Significant Accounting Policies [Line Items]                  
Depreciation and amortization expense $ 1,528                
Cash and Cash Equivalents Three months or less                
Amortization expense       7,571 10,740 14,668 871 1,529 3,003
Accumulated amortization deferred financing cost 15,063 13,086              
Allowance for doubtful accounts receivable 1,875 2,675              
Deferred rent receivable allowance amount 1,733 2,302              
Minimum percentage of taxable income to be distributed 90.00%                
Franchise tax reserve   $ 745 $ 745