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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule Of Income Tax [Line Items] |  |  |  |  |  |
Tax effected net operating losses that expire | $ 635 |  |  | $ 635 |  |
NOL expiration date |  |  |  | 2024 |  |
Tax effected NOLs - International |  |  |  | $ 8,992 |  | $ 6,605
Federal statutory rate | 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 | $ 30,877 | $ 31,593 |  | $ 30,877 |  | 34,876
Unrecognized tax benefits that would impact effective tax rate | 25,179 |  |  | 25,179 |  |
Tax effected capital loss | 794 |  |  | 794 |  | 794
Income Tax Expense (Benefit) | $ 3,587 |  | $ 5,460 | $ 2,538 | $ 9,958 |
Reduction in unrecognized tax benefits |  | $ 4,309 |  |  |  |
Estimated effective rate | 59.10% |  | 24.60% | 18.30% | 27.60% |
International Tax Authority [Member] |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |
Tax effected net operating losses that expire | $ 4,315 |  |  | $ 4,315 |  |
Operating loss Expiration Period |  |  |  | expire between 2036 and 2039 |  |
Advisor Engine [Member] |  |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |  |
Tax effected capital loss | 794 |  |  | $ 794 |  |
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 | $ 30,877 |  |  | $ 30,877 |  | $ 34,876

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