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Document And Entity Information - USD ($) $ in Millions	12 Months Ended
Document And Entity Information - USD ($) $ in Millions	Dec. 31, 2019	Feb. 28, 2020	Jun. 28, 2019
Entity Listings [Line Items]
Entity Registrant Name	CAI International, Inc.
Entity Filer Category	Accelerated Filer
Entity Central Index Key	0001388430
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Type	10-K
Document Fiscal Period Focus	FY
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		17,487,222
Entity Public Float			$ 391.4
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity File Number	001-33388
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3109229
Entity Address, Address Line One	Steuart Tower, 1 Market Plaza, Suite 2400
Entity Address, City or Town	San Francisco
Entity Address, Postal Zip Code	94105
Entity Address, State or Province	CA
City Area Code	415
Local Phone Number	788-0100
Documents Incorporated by Reference [Text Block]	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive proxy statement relating to the registrant’s 2020 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, 2019, 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