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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 |  |

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