v3.8.0.1
Acquisitions - Purchase Price Allocation for Acquisitions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Direct financing investments $ 3,546 $ 544 $ 9,595
Mortgages payable, net (11,926)    
Non-real estate liabilities (2,777) (8,649) (13,408)
Business combination, recognized identifiable assets acquired and liabilities assumed, assets 681,289 510,163 536,720
Land      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment 67,945 70,938 48,060
Land Improvements      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment 54,804 38,526 40,715
Buildings and Other Improvements      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment 508,541 358,058 391,528
Equipment      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, property, plant, and equipment 7,671    
Acquired In-Place Leases      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets 77,073 52,867 58,874
Acquired Above-Market Leases      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible assets 14,905 19,420 15,108
Acquired Below-Market Leases      
Business Acquisition [Line Items]      
Business combination, recognized identifiable assets acquired and liabilities assumed, Intangible liabilities $ (38,493) $ (21,541) $ (13,752)