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Non-controlling Interests - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2013
Houston, Texas Operating Property [Member]
Mar. 05, 2014
River City [Member]
Mar. 05, 2014
Norridge [Member]
Mar. 31, 2014
Norridge [Member]
Mar. 31, 2014
Westheimer [Member]
Noncontrolling Interest [Line Items]              
Percentage of non-controlling ownership interests     2.00%       32.00%
Investment in equity investments $ 40,002,000 $ 13,000 $ 150,000        
Purchase price accounting, carrying value of the acquired non-controlling interest 16,453,000   253,000        
Purchase price accounting, adjustments in paid-in capital     103,000        
Decrease in non-controlling interest due to property sale 3,764,000     3,764,000      
Increase in non-controlling interest due to consolidation of property $ 16,391,000       $ 16,391,000 $ 16,391,000