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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Feb. 25, 2021
Jun. 30, 2020
Entity Listings [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 001-33388    
Entity Registrant Name CAI International, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3109229    
Entity Address, Address Line One Steuart Tower, 1 Market Plaza    
Entity Address, Address Line Two Suite 2400    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94105    
City Area Code 415    
Local Phone Number 788-0100    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   17,284,656  
Entity Public Float     $ 259.6
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Amendment Flag false    
Entity Central Index Key 0001388430    
Documents Incorporated by Reference DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement relating to the registrant’s 2021 Annual Meeting of Stockholders, which will be filed no later than 120 days after the close of the registrant’s fiscal year ended December 31, 2020, are incorporated by reference into Part III hereof. 		   
Common Stock [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol CAI    
Security Exchange Name NYSE    
Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security 8.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock, par value $0.0001 per share    
Trading Symbol CAI-PA    
Security Exchange Name NYSE    
Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security 8.50% Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock, par value $0.0001 per share    
Trading Symbol CAI-PB    
Security Exchange Name NYSE