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Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Securities owned, at fair value	$ 13,110	$ 17,319
Liabilities:
Deferred consideration (Note 11)	198,784	173,024
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	67	317
Securities owned, at fair value	13,110	17,319
Total	13,177	17,636
Liabilities:
Deferred consideration (Note 11)	198,784	173,024
Securities sold, but not yet purchased		582
Total		173,606
Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. – Financial interests		28,172
Liabilities:
Convertible notes	145,847
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	67	317
Securities owned, at fair value	13,110	17,319
Total	13,177	17,636
Liabilities:
Securities sold, but not yet purchased		582
Total		582
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Liabilities:
Convertible notes	145,847
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Deferred consideration (Note 11)	$ 198,784	173,024
Total		173,024
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. – Financial interests		$ 28,172

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of notes payable.

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Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

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AdvisorEngine Inc. - Financial Interests.

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