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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule Of Income Tax [Line Items]      
Pre-tax federal net operating losses that expire $ 2,622    
Pre-tax federal net operating losses expiration date 2024    
Tax effected NOLs - Foreign $ 8,222   $ 6,605
Federal statutory rate 21.00% 21.00%  
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return $ 31,593   $ 34,876
Unrecognized tax benefits that would impact effective tax rate 25,847    
Pre-tax capital loss 572    
Income Tax Expense (Benefit) (1,049) $ 4,498  
Reduction in unrecognized tax benefits $ 4,309    
Estimated effective rate (13.50%) 32.30%  
Foreign Tax Authority [Member]      
Schedule Of Income Tax [Line Items]      
Pre-tax federal net operating losses that expire $ 4,050    
Operating loss Expiration Period expire between the years 2036 and 2039    
Advisor Engine [Member]      
Schedule Of Income Tax [Line Items]      
Pre-tax capital loss $ 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 $ 31,593