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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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