| Cover - shares | 3 Months Ended | |
| Mar. 31, 2024 | May 09, 2024 | |
| Document Type | 10-Q/A | |
| Amendment Flag | false | |
| Document Quarterly Report | true | |
| Document Transition Report | false | |
| Document Period End Date | Mar. 31, 2024 | |
| Document Fiscal Period Focus | Q1 | |
| Document Fiscal Year Focus | 2024 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity File Number | 001-37949 | |
| Entity Registrant Name | Innovative Industrial Properties, Inc. | |
| Entity Central Index Key | 0001677576 | |
| Entity Tax Identification Number | 81-2963381 | |
| Entity Incorporation, State or Country Code | MD | |
| Entity Address, Address Line One | 1389 Center Drive, Suite 200 | |
| Entity Address, City or Town | Park City | |
| Entity Address, State or Province | UT | |
| Entity Address, Postal Zip Code | 84098 | |
| City Area Code | 858 | |
| Local Phone Number | 997-3332 | |
| 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 | 28,328,647 | |
| Common Stock Par Value 0. 001 Per Share [Member] | ||
| Title of 12(b) Security | Common Stock, par value $0.001 per share | |
| Trading Symbol | IIPR | |
| Security Exchange Name | NYSE | |
| Series A Preferred Stock, par value $0.001 per share | ||
| Title of 12(b) Security | Series A Preferred Stock, par value $0.001 per share | |
| Trading Symbol | IIPR-PA | |
| Security Exchange Name | NYSE |
