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Real Estate Assets - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
store
land_parcel
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Real Estate [Abstract]      
Number of operating stores classified as held for sale | store 1    
Number of parcels of land classified as held for sale | land_parcel 1    
Impairment loss $ 6,100    
Average period that a tenant is expected to utilize the facility 18 months    
Amortization related to the tenant relationships and lease rights $ 14,349 $ 21,133 $ 11,695
Real Estate Properties [Line Items]      
Intangible assets, accumulated amortization $ 112,347 $ 101,120  
Minimum      
Real Estate Properties [Line Items]      
Remaining amortization period 1 year    
Maximum      
Real Estate Properties [Line Items]      
Remaining amortization period 44 years