Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($) reporting_units	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule Of Significant Accounting Policies [Line Items]
Provision for income taxes	$ 3,491,000	$ 9,711,000	$ 13,904,000
Foreign Currency Transaction Gain (Loss), before Tax	$ (1,854,000)	(2,791,000)	(1,595,000)
Number of reporting units | reporting_units	2
Goodwill impairment loss	$ 0	0	0
Valuation allowance	0
Uncertain tax position	184,000	184,000	$ 160,000
Unrecognized tax benefits	$ 38,000	$ 51,000
Effective Income Tax Rate Reconciliation, Percent	37.10%	26.60%	41.00%
Furniture and fixtures | Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	3 years
Furniture and fixtures | Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	7 years
Leasehold improvements
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	lesser of the estimated useful life or lease term
Westwood International Advisors Inc | Canadian Plan
Schedule Of Significant Accounting Policies [Line Items]
Compensation expense recorded	$ 200,000	$ 100,000	$ 200,000
Retained Earnings
Schedule Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(700,000)
Adoption of ASU 2016-09 [Member]
Schedule Of Significant Accounting Policies [Line Items]
Provision for income taxes		$ 1,000,000.0