Annual report pursuant to Section 13 and 15(d)

Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail)

v3.19.3.a.u2
Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
SARs liability $ 2,080 $ 1,810
Deferred compensation liability 1,553 1,288
Deferred compensation and commissions, current 44,301 47,910
SARs liability 18,122 19,299
Deferred compensation liability 6,688 6,605
Deferred compensation and commissions, non-current 45,628 49,887
Current [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Commissions payable to investment sales and financing professionals 40,668 44,812
Non-Current [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Commissions payable to investment sales and financing professionals $ 20,818 $ 23,983