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Investments in Unconsolidated Joint Ventures - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 29, 2019
May 18, 2018
Mar. 20, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 31, 2018
Mar. 31, 2018
Schedule Of Equity Method Investments [Line Items]                  
Cash proceeds from sale of real estate           $ 53,758,000 $ 134,599,000    
Gain on sale of real estate           32,873,000 76,018,000    
Joint venture impairment charges       $ 0 $ 0 0 0    
West Hartford JV [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Income earned from servicing activities       $ 1,800,000 $ 914,000 $ 2,100,000 $ 914,000    
Santa Monica, CA [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, ownerhip interest retained percentage                 50.10%
West Hartford, CT [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, ownerhip interest retained percentage               50.00%  
Cockeysville, MD [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, ownerhip interest retained percentage       50.00%   50.00%      
Invesco Real Estate [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, ownerhip interest retained percentage       50.10%   50.10%      
Invesco Real Estate [Member] | Santa Monica, CA [Member] | Mark 302 JV [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Percentage of interest sold     49.90%            
Initial contribution value     $ 90,000,000.0            
Pre-transaction development and other costs     10,400,000            
Cash proceeds from sale of real estate     50,100,000            
Gain on sale of real estate     $ 38,800,000            
Real estate investment, ownerhip interest retained percentage     50.10%            
Gain on sale of real estate investment, ownership interest     $ 19,400,000            
Invesco Real Estate [Member] | Santa Monica, CA [Member] | Mark 302 JV [Member] | Maximum [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Investment in joint venture revaluation date     Dec. 31, 2020            
Final contribution value     $ 105,000,000.0            
Gain or loss on sale of real estate based on final contribution value     53,800,000            
Invesco Real Estate [Member] | Santa Monica, CA [Member] | Mark 302 JV [Member] | Minimum [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Final contribution value     60,000,000.0            
Gain or loss on sale of real estate based on final contribution value     8,800,000            
Invesco Real Estate [Member] | Santa Monica, CA [Member] | Mark 302 JV [Member] | ASU 2017-05 [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, gain from increase in fair value     $ 19,400,000            
Invesco Real Estate [Member] | West Hartford, CT [Member] | West Hartford JV [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Percentage of interest sold   50.00%              
Initial contribution value   $ 25,000,000.0              
Pre-transaction development and other costs   20,200,000              
Cash proceeds from sale of real estate   22,600,000              
Gain on sale of real estate   1,200,000              
Real estate investment, gain from increase in fair value   600,000              
Gain on sale of real estate investment, ownership interest   $ 600,000              
Invesco Real Estate [Member] | West Hartford, CT [Member] | West Hartford JV [Member] | Maximum [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Investment in joint venture revaluation date   Dec. 31, 2019              
Final contribution value   $ 29,600,000              
Gain or loss on sale of real estate based on final contribution value   5,800,000              
Real estate tax adjustment amount   4,600,000              
Invesco Real Estate [Member] | West Hartford, CT [Member] | West Hartford JV [Member] | Minimum [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Final contribution value   20,400,000              
Gain or loss on sale of real estate based on final contribution value   $ (3,400,000)              
Invesco Real Estate [Member] | West Hartford, CT [Member] | West Hartford JV [Member] | ASU 2017-05 [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, ownerhip interest retained percentage   50.00%              
Invesco Real Estate [Member] | Cockeysville, MD [Member] | Cockeysville JV [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Percentage of interest sold 50.00%                
Initial contribution value $ 12,500,000                
Pre-transaction development and other costs 6,200,000                
Cash proceeds from sale of real estate 9,300,000                
Gain on sale of real estate 3,800,000                
Real estate investment, gain from increase in fair value 1,900,000                
Gain on sale of real estate investment, ownership interest $ 1,900,000                
Invesco Real Estate [Member] | Cockeysville, MD [Member] | Cockeysville JV [Member] | ASU 2017-05 [Member]                  
Schedule Of Equity Method Investments [Line Items]                  
Real estate investment, ownerhip interest retained percentage 50.00%