Annual report pursuant to Section 13 and 15(d)

Real Estate Dispositions Held for Sale and Impairment Charges - Components of Operating Income from Real Estate and Related Assets Disposed (Detail)

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Real Estate Dispositions Held for Sale and Impairment Charges - Components of Operating Income from Real Estate and Related Assets Disposed (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]                      
Total operating revenues $ 21,823 $ 21,375 $ 20,688 $ 19,880 $ 19,216 $ 19,014 $ 18,390 $ 17,136 $ 83,766 $ 73,756 $ 61,343
Real Estate Asset Disposal [Member]                      
Real Estate Properties [Line Items]                      
Operating revenue                 751 669 669
Operating expense                 100 203 193
Other expense                 (136) (160) (163)
Total operating revenues                 $ 515 $ 306 $ 313