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Non-controlling Interests - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
7 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Jul. 31, 2014
Sep. 30, 2013
Mar. 05, 2014
Mar. 05, 2014
River City [Member]
Mar. 05, 2014
Norridge [Member]
Sep. 30, 2014
Houston, Texas Operating Property [Member]
Sep. 30, 2014
Westheimer [Member]
Noncontrolling Interest [Line Items]              
Percentage of non-controlling ownership interests           2.00% 32.00%
Investment in equity investments $ 48,154 $ 11,982       $ 150  
Purchase price accounting, carrying value of the acquired non-controlling interest     16,453     253  
Purchase price accounting, adjustments in paid-in capital           103  
Decrease in non-controlling interest due to property sale 3,764     3,764      
Increase in non-controlling interest due to consolidation of property $ 16,391       $ 16,391