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Related Party Transactions - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Hotel
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 30, 2015
Hotel
Related Party Transaction [Line Items]        
Number of hotels in ownership by Company | Hotel 40      
Management and accounting fees paid by the company | $ $ 9.9 $ 9.2 $ 8.5  
Amounts due to related party | $ 1.2 0.9    
Management fees recorded within hotel other operating expenses | $ 9.9 9.4 8.7  
Island Hospitality Management Inc.        
Related Party Transaction [Line Items]        
Management fees recorded within hotel other operating expenses | $ $ 0.2 0.3 0.3  
Inland Joint Venture        
Related Party Transaction [Line Items]        
Number of hotels in ownership by Company | Hotel 48      
Number of hotels acquired | Hotel 48     48
NewINK Joint Venture        
Related Party Transaction [Line Items]        
Number of hotels in ownership by Company | Hotel 47     47
Insurance expense | $ $ 6.8 6.9 4.7  
Island Hospitality Management Inc.        
Related Party Transaction [Line Items]        
Ownership percentage in related party owned by the company's chairman 51.00%      
Number of hotels managed by related party | Hotel 40      
Management fees recorded within hotel other operating expenses | $ $ 0.2 $ 0.3 $ 0.3  
Island Hospitality Management Inc. | Inland Joint Venture        
Related Party Transaction [Line Items]        
Number of hotels managed by related party | Hotel 34      
NorthStar Realty Finance Corp        
Related Party Transaction [Line Items]        
Ownership percentage in related party owned by the company's chairman 2.50%      
Ownership percentage in related party owned by third party 97.50%