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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Commissions $ 28,397 $ 85,422
Investment banking:    
Underwriting 2,534 12,127
Private placement 13,567 26,866
Advisory 4,915 7,062
Other 0 156
Sub-total National revenue from contracts with customers 49,413 131,633
Other National Revenue 9,107 33,428
Total National revenue $ 58,520 $ 165,061