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Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 31, 2014
Jacksonville, Florida [Member]
Jun. 30, 2014
Louisville, Kentucky [Member]
Jun. 30, 2014
Marc Realty [Member]
Jun. 30, 2014
Northwest Atlanta Partners LP [Member]
Jun. 30, 2014
Sealy [Member]
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Maximum [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2014
Lisle, Illinois Property Sale [Member]
Mar. 31, 2014
Greensboro, North Carolina Sale [Member]
Jun. 30, 2014
Significant Unobservable Inputs (Level 3) [Member]
Financial Instruments And Fair Value Measurements [Line Items]                                        
Inter-level transfer of assets $ 0   $ 0 $ 0 $ 0                              
Inter-level transfer of liabilities 0   0 0 0                              
Loan securities carried at fair value 226     226   226                           0
Loan security face value                                       20.00%
Property impairment charges       9,287 154   200 87             154 9,287 154 8,500 500  
Impairment charge on equity investment                           762   762        
Discount rate   8.00%               10.80%                    
Terminal capitalization rate                   8.50%   8.50% 10.00%              
Market rent growth rate   2.00%               2.70%                    
Expense growth rate   2.00%               2.80%                    
Other-than-temporary impairment charge                 762   1,660                  
Net unrealized gains (loss) 0   (1,645) 0 73                              
Change in fair value of loan securities $ 0     $ 0