Quarterly report pursuant to Section 13 or 15(d)

Revenues from Contracts and Significant Customers - presents National???s revenues (Detail)

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Revenues from Contracts and Significant Customers - presents National’s revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Commissions $ 31,407 $ 57,025
Investment banking:    
Underwriting 6,893 9,593
Private placement 3,484 13,299
Advisory 833 2,147
Other (4) 156
Sub-total National revenue from contracts with customers 42,613 82,220
Other National revenue 14,406 24,321
Total National revenue $ 57,019 $ 106,541