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Variable Interest Entities - Summary of Information about Variable Interests (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount - Assets    
Total net carrying value $ 0 $ 28,172,000
Total net carrying value 896,692,000 935,207,000
Advisor Engine [Member]    
Carrying Amount - Assets    
Unsecured convertible notes receivable 0 2,126,000
Unsecured non-convertible note receivable 0 26,046,000
Preferred stock 0  
Total net carrying value 0 28,172,000
Securrency Inc [Member]    
Carrying Amount - Assets    
Preferred stock 8,112,000 8,112,000
Variable Interest Entity, Not Primary Beneficiary [Member]    
Carrying Amount - Assets    
Total net carrying value 8,112,000 36,284,000
Maximum exposure to loss $ 8,112,000 $ 36,284,000