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Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]        
Total operating revenues $ 66,293 $ 74,775 $ 131,778 $ 133,679
Advisory Fees [Member]        
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]        
Total operating revenues 65,627 73,778 130,467 132,234
Other Income [Member]        
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]        
Total operating revenues $ 666 $ 997 $ 1,311 $ 1,445