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Real Estate Acquired - Allocation of Purchase Prices to Acquired Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Land $ 3,900 $ 66,047 $ 3,100
Buildings $ 100 4,873 $ 2,000
Below Market Rent   (5,069)  
Total Purchase Price   67,950  
In-Place Leases      
Business Acquisition [Line Items]      
Intangible assets   2,099  
Above Market Rents      
Business Acquisition [Line Items]      
Intangible assets   0  
1580 Rockville Pike      
Business Acquisition [Line Items]      
Land   9,600  
Buildings   2,200  
Below Market Rent   (4,313)  
Total Purchase Price   8,000  
1580 Rockville Pike | In-Place Leases      
Business Acquisition [Line Items]      
Intangible assets   513  
1580 Rockville Pike | Above Market Rents      
Business Acquisition [Line Items]      
Intangible assets   0  
1582 Rockville Pike      
Business Acquisition [Line Items]      
Land   9,742  
Buildings   828  
Below Market Rent   (419)  
Total Purchase Price   11,000  
1582 Rockville Pike | In-Place Leases      
Business Acquisition [Line Items]      
Intangible assets   849  
1582 Rockville Pike | Above Market Rents      
Business Acquisition [Line Items]      
Intangible assets   0  
750 N. Glebe Road      
Business Acquisition [Line Items]      
Land   38,224  
Buildings   1,327  
Below Market Rent   0  
Total Purchase Price   40,000  
750 N. Glebe Road | In-Place Leases      
Business Acquisition [Line Items]      
Intangible assets   449  
750 N. Glebe Road | Above Market Rents      
Business Acquisition [Line Items]      
Intangible assets   0  
730 N. Glebe Road      
Business Acquisition [Line Items]      
Land   2,683  
Buildings   78  
Below Market Rent   0  
Total Purchase Price   2,800  
730 N. Glebe Road | In-Place Leases      
Business Acquisition [Line Items]      
Intangible assets   39  
730 N. Glebe Road | Above Market Rents      
Business Acquisition [Line Items]      
Intangible assets   0  
1584 Rockville Pike      
Business Acquisition [Line Items]      
Land   5,798  
Buildings   440  
Below Market Rent   (337)  
Total Purchase Price   6,150  
1584 Rockville Pike | In-Place Leases      
Business Acquisition [Line Items]      
Intangible assets   249  
1584 Rockville Pike | Above Market Rents      
Business Acquisition [Line Items]      
Intangible assets   $ 0