Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Stock appreciation rights ("SARs") liability $ 1,895 $ 1,810
Deferred compensation liability 1,437 1,288
Deferred compensation and commissions, current 32,450 47,910
Stock appreciation rights ("SARs") liability 18,082 19,299
Deferred compensation liability 6,755 6,605
Deferred compensation and commissions, non-current 41,695 49,887
Current [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Commissions payable to investment sales and financing professionals 29,118 44,812
Non-Current [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Commissions payable to investment sales and financing professionals $ 16,858 $ 23,983