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Revenues from Contracts with Customers - Summary of Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]    
Total revenues from contracts with customers $ 58,756  
Total revenues 59,605 $ 54,599
Advisory Fees [Member]    
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]    
Total revenues from contracts with customers 58,455  
Other [Member]    
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]    
Total revenues from contracts with customers 301  
Other Sources of Revenues [Member]    
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]    
Total revenues $ 849