Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail)

v3.6.0.2
Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail) - Asset Acquisitions [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
acquisition
Dec. 31, 2015
USD ($)
acquisition
Dec. 31, 2014
USD ($)
acquisition
Business Acquisition [Line Items]      
Number Of Acquisitions Completed | acquisition 2 6 11
Rental Revenue $ 1,462 $ 4,919 $ 5,605
Earnings $ (162) $ (63) $ 36