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Non-controlling Interests - Additional Information (Detail) (USD $)
6 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 05, 2014
Jun. 30, 2014
Houston, Texas Operating Property [Member]
Mar. 05, 2014
River City [Member]
Mar. 05, 2014
Norridge [Member]
Jun. 30, 2014
Westheimer [Member]
Noncontrolling Interest [Line Items]              
Percentage of non-controlling ownership interests       2.00%     32.00%
Investment in equity investments $ 45,709,000 $ 5,819,000   $ 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