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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Outstanding Principal $ 909,404 $ 784,640
Unamortized Discount and Debt Issuance Costs (6,118) (6,198)
Carrying Amount $ 903,286 $ 778,442
Weighted Average Rate 3.60% 3.60%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 3 months 18 days 5 years 8 months 12 days
Mortgages    
Debt Instrument [Line Items]    
Outstanding Principal $ 619,399 $ 580,635
Unamortized Discount and Debt Issuance Costs (3,008) (2,927)
Carrying Amount $ 616,391 $ 577,708
Type Fixed Fixed
Weighted Average Rate 3.80% 3.70%
Mortgages | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 8 months 12 days 5 years 9 months 18 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 190,005 [1] $ 104,005 [2]
Unamortized Discount and Debt Issuance Costs (2,216) [1] (2,376) [2]
Carrying Amount $ 187,789 [1] $ 101,629 [2]
Type Floating [1] Floating [2]
Weighted Average Rate 3.00% [1] 3.00% [2]
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 3 years 3 months 18 days [1] 3 years 9 months 18 days [2]
Term Loan    
Debt Instrument [Line Items]    
Outstanding Principal $ 100,000 $ 100,000
Unamortized Discount and Debt Issuance Costs (894) (895)
Carrying Amount $ 99,106 $ 99,105
Type Floating Floating
Weighted Average Rate 3.20% 3.20%
Term Loan | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 6 years 7 months 6 days 6 years 10 months 24 days
[1] The unsecured credit facility total capacity is $300,000, of which $190,005 was outstanding as of March 31, 2018.
[2] The secured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.