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Segment Information - Components of Corporate/Other (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Interest income | $ 66,787 | $ 63,373 | $ 129,115 | $ 127,119
Interest expense | (22,444) | (23,008) | (46,394) | (46,969)
Net Interest Income | 44,343 | 40,365 | 82,721 | 80,150
Investment fair value changes, net | (11,066) | (1,788) | (30,604) | (2,936)
Realized gains, net | 9,884 | 6,316 | 19,422 | 10,622
Total non-interest income (loss), net | 10,888 | 14,104 | 15,342 | 9,073
Direct operating expenses | (20,155) | (25,218) | (50,607) | (50,281)
(Provision for) benefit from income taxes | (327) | (2,448) | (355) | 2,868
Net Income | 41,281 | 27,064 | 53,344 | 41,865
Corporate/Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 4,831 | 6,469 | 9,773 | 13,494
Interest expense | (12,681) | (13,553) | (25,437) | (27,438)
Net Interest Income | (7,850) | (7,084) | (15,664) | (13,944)
Investment fair value changes, net | (287) | (684) | (1,923) | (1,813)
Realized gains, net | 0 | 0 | 292 | 0
Total non-interest income (loss), net | (287) | (684) | (1,631) | (1,813)
Direct operating expenses | (11,281) | (9,994) | (32,949) | (19,554)
(Provision for) benefit from income taxes | 0 | 598 | 0 | 1,544
Net Income | (19,418) | (17,164) | (50,244) | (33,767)
Corporate/Other | Legacy Consolidated VIEs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 4,911 | 6,462 | 9,688 | 13,480
Interest expense | (3,271) | (4,048) | (6,568) | (8,530)
Net Interest Income | 1,640 | 2,414 | 3,120 | 4,950
Investment fair value changes, net | (251) | (684) | (1,831) | (1,777)
Realized gains, net |  |  | 0 | 0
Total non-interest income (loss), net | (251) | (684) | (1,831) | (1,777)
Direct operating expenses | 0 | 0 | 0 | 0
(Provision for) benefit from income taxes | 0 | 0 | 0 | 0
Net Income | 1,389 | 1,730 | 1,289 | 3,173
Corporate/Other | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | (80) | 7 | 85 | 14
Interest expense | (9,410) | (9,505) | (18,869) | (18,908)
Net Interest Income | (9,490) | (9,498) | (18,784) | (18,894)
Investment fair value changes, net | (36) | 0 | (92) | (36)
Realized gains, net |  |  | 292 | 0
Total non-interest income (loss), net | (36) | 0 | 200 | (36)
Direct operating expenses | (11,281) | (9,994) | (32,949) | (19,554)
(Provision for) benefit from income taxes | 0 | 598 | 0 | 1,544
Net Income | $ (20,807) | $ (18,894) | $ (51,533) | $ (36,940)

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