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Cover Page - shares
6 Months Ended
Jun. 30, 2020
Aug. 06, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2020  
Document Transition Report false  
Entity File Number 001-32641  
Entity Registrant Name BROOKDALE SENIOR LIVING INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-3068069  
Entity Address, Address Line One 111 Westwood Place,  
Entity Address, Address Line Two Suite 400,  
Entity Address, City or Town Brentwood,  
Entity Address, State or Province TN  
Entity Address, Postal Zip Code 37027  
City Area Code 615  
Local Phone Number 221-2250  
Title of 12(b) Security Common Stock, $0.01 Par Value Per Share  
Entity Trading Symbol BKD  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   183,240,758
Entity Central Index Key 0001332349  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Amendment Flag false