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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Business Acquisition [Line Items]      
Goodwill $ 566,009 $ 564,300  
InR Advisory Services, LLC (“InR”) and Laurus Transaction Advisors, LLC (“Laurus”) [Member]      
Business Acquisition [Line Items]      
Cash     $ 306
Accounts receivable, net 550   1,920
Other assets 5   12
Identifiable intangible assets 654   3,864
Current liabilities (288)   (1,717)
Total identifiable net assets 921   4,385
Goodwill 2,165   32,255
Aggregate purchase price $ 3,086   $ 36,640