Acquisitions	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions	AcquisitionsOn December 29, 2023, the Company acquired 100% of the membership interests of BondWave LLC, a cloud-based financial markets software as a service provider that offers institutions active in fixed income markets with an integrated suite of portfolio analytics, transaction analytics and proprietary data solutions. Under the terms of the agreement, the Company paid approximately $3.6 million on closing, with the potential for additional contingent payments to be made within 18 months after the closing date. The Company accounted for the acquisition under the acquisition method of accounting in accordance with ASC 805, “Business Combinations.” The Company allocated $4.3 million of the purchase price to goodwill, $2.2 million to definite-lived intangible assets, $625 thousand to cash acquired and the remainder to other assets acquired and liabilities assumed as part of the acquisition. The goodwill, which has been allocated to the “Corporate/Other” segment, primarily reflects the expected synergies of combining the scalable software platform with Oppenheimer’s broader client base.