XML 12 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2019
Jul. 26, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 1-13045  
Entity Registrant Name IRON MOUNTAIN INC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 23-2588479  
Entity Address, Address Line One One Federal Street  
Entity Address, City or Town Boston  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02110  
City Area Code 617  
Local Phone Number 535-4766  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Small Business Entity false  
Emerging Growth Company false  
Entity Shell Company false  
Title of 12(b) Security Common Stock, $.01 par value  
Trading Symbol IRM  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   287,106,811
Entity Central Index Key 0001020569  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false