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Consolidation - Revenue and Expenses of Consolidated Investment Product (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income: |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 128,024 | $ 123,675 | $ 94,132 | $ 79,776 | $ 79,850 | $ 82,324 | $ 80,085 | $ 80,295 | $ 425,607 | $ 322,554 | $ 381,977
Expenses: |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Common Stockholders | $ 3,414 | $ 16,708 | $ (2,389) | $ 10,943 | $ 12,426 | $ 15,625 | $ 8,088 | $ 12,363 | 28,676 | $ 48,502 | $ 35,106
CLOs |  |  |  |  |  |  |  |  |  |  |
Income: |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized gain (loss), net |  |  |  |  |  |  |  |  | 7,270 |  |
Interest Income |  |  |  |  |  |  |  |  | 45,526 |  |
Other income |  |  |  |  |  |  |  |  | 1,552 |  |
Total revenues |  |  |  |  |  |  |  |  | 54,348 |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 6,684 |  |
Interest expense |  |  |  |  |  |  |  |  | 35,243 |  |
Total Expense |  |  |  |  |  |  |  |  | 41,927 |  |
Noncontrolling interest |  |  |  |  |  |  |  |  | (1,507) |  |
Net Income (Loss) Attributable to Common Stockholders |  |  |  |  |  |  |  |  | $ 10,914 |  |

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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