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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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