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Income Taxes - Additional Information (Detail)
£ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 11, 2018
USD ($)
Apr. 11, 2018
GBP (£)
Schedule Of Income Tax [Line Items]          
Pre-tax federal net operating losses that expire $ 3,147        
Pre-tax federal net operating losses expiration date 2024        
Tax effected NOLs - Foreign $ 6,605 $ 3,841 $ 4,551    
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return 34,876        
Unrecognized tax benefits that would impact effective tax rate 28,101        
Pre-tax capital loss 17,386   $ 1,676    
Foreign Tax Authority [Member]          
Schedule Of Income Tax [Line Items]          
Pre-tax federal net operating losses that expire $ 3,715        
Operating loss Expiration Period expire between the years 2036 and 2038        
Advisor Engine [Member]          
Schedule Of Income Tax [Line Items]          
Pre-tax capital loss $ 3,278 $ 3,278      
Other Noncurrent Liabilities [Member]          
Schedule Of Income Tax [Line Items]          
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return $ 34,876        
Acquisition Of Etfs Business [Member]          
Schedule Of Income Tax [Line Items]          
Accrued uncertain tax position liability       $ 31,317 £ 22,118
Interest and penalties       $ 7,171 £ 5,065