Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Selected Balance Sheet Data - Components of Deferred Compensation and Commissions (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Stock appreciation rights ("SARs") liability $ 1,969 $ 1,810
Deferred compensation liability 1,451 1,288
Deferred compensation and commissions, current 31,638 47,910
Stock appreciation rights ("SARs") liability 17,856 19,299
Deferred compensation liability 7,169 6,605
Deferred compensation and commissions, non-current 38,964 49,887
Current [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Commissions payable to investment sales and financing professionals 28,218 44,812
Non-Current [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Commissions payable to investment sales and financing professionals $ 13,939 $ 23,983