Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net loss	$ (122,693)	$ (52,500)
Net loss attributable to non-controlling interest	(41,012)	(20,548)
Accretion and dividend Series A and B convertible redeemable preferred stock	(11,653)	0
Net loss attributable to Digital Media Solutions, Inc. - Class A common stock - basic	$ (93,334)	$ (31,952)
Denominator:
Weighted-average Class A common shares outstanding – basic (in shares)	2,920	2,581
Add: dilutive effects of equity awards under the 2020 Omnibus Incentive Plan (in shares)	0	2
Weighted-average Class A common shares outstanding – diluted (in shares)	2,920	2,583
Net loss per common share:
Basic – per Class A common shares (in usd per share)	$ (31.96)	$ (12.38)
Diluted – per Class A common shares (in usd per share)	$ (31.96)	$ (12.37)