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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Apr. 02, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 11,042		$ 11,250
Fixed-income available-for-sale securities	77,977		76,733
Fixed-income securities owned	28,981		21,526
Investment funds sponsored by LSV	5,739		6,034
Assets, fair value	123,739		115,543
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	11,042		11,250
Fixed-income available-for-sale securities	0		0
Fixed-income securities owned	0		0
Assets, fair value	11,042		11,250
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0		0
Fixed-income available-for-sale securities	77,977		76,733
Fixed-income securities owned	28,981		21,526
Assets, fair value	$ 106,958		$ 98,259
Huntington Steele, LLC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent purchase price		$ 13,220

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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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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