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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Outstanding Principal $ 996,508 $ 991,415
Unamortized Discount and Debt Issuance Costs (5,588) (5,927)
Carrying Amount $ 990,920 $ 985,488
Weighted Average Rate 3.90% 3.90%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 4 years 8 months 12 days 4 years 9 months 18 days
Mortgages    
Debt Instrument [Line Items]    
Outstanding Principal $ 584,765 $ 585,672
Unamortized Discount and Debt Issuance Costs (2,441) (2,547)
Carrying Amount $ 582,324 $ 583,125
Type Fixed Fixed
Weighted Average Rate 3.80% 3.80%
Mortgages | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 4 years 10 months 24 days 5 years 1 month 6 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 111,743 [1] $ 155,743 [2]
Unamortized Discount and Debt Issuance Costs (1,598) [1] (1,760) [2]
Carrying Amount $ 110,145 [1] $ 153,983 [2]
Type Floating [1] Floating [2]
Weighted Average Rate 4.10% [1] 3.90% [2]
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 2 years 6 months [1] 2 years 8 months 12 days [2]
Unsecured Term Loans    
Debt Instrument [Line Items]    
Outstanding Principal $ 300,000 $ 250,000
Unamortized Discount and Debt Issuance Costs (1,549) (1,620)
Carrying Amount $ 298,451 $ 248,380
Type Floating Floating
Weighted Average Rate 4.10% 4.00%
Unsecured Term Loans | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 1 month 6 days 5 years 4 months 24 days
[1] The unsecured credit facility total capacity is $300,000, of which $111,743 was outstanding as of March 31, 2019.
[2] The unsecured credit facility total capacity was $300,000, of which $155,743 was outstanding as of December 31, 2018.