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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jun. 30, 2019
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Tax effected net operating losses that expire | $ 642 |  |  | $ 642 |  |  |
NOL expiration date |  |  |  | 2024 |  |  |
Tax effected NOLs - International |  |  |  | $ 8,776 |  | $ 6,605 |
Federal statutory rate | 21.00% |  | 21.00% | 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 | $ 29,985 | $ 31,593 |  | $ 29,985 |  | 34,876 | $ 30,877
Unrecognized tax benefits that would impact effective tax rate | 24,369 |  |  | 24,369 |  |  |
Tax effected capital loss | 803 |  |  | 803 |  | 794 |
Income Tax Expense (Benefit) | $ 4,483 |  | $ 5,481 | 7,021 | $ 15,439 |  |
Reduction in unrecognized tax benefits |  | $ 4,309 |  | $ 4,309 |  |  |
Estimated effective rate | 51.90% |  | 19.90% | 31.20% | 24.30% |  |
International Tax Authority [Member] |  |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Tax effected net operating losses that expire | $ 4,575 |  |  | $ 4,575 |  |  |
Operating loss Expiration Period |  |  |  | expire between 2036 and 2039. |  |  |
Advisor Engine [Member] |  |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |  |
Tax effected capital loss | 803 |  |  | $ 803 |  |  |
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 | $ 29,985 |  |  | $ 29,985 |  | $ 34,876 |

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