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Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Limited Partnerships (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Operating results: |  |  |  |  |
Total income (loss) | $ 69,808 | $ 61,262 | $ 192,075 | $ 222,540 |
Limited Partnership [Member] |  |  |  |  |
Operating results: |  |  |  |  |
Total income (loss) | 166,374 | 82 | 143,305 | (4,756) |
Total expenses | (54,577) | (386) | (184,598) | (1,343) |
Net (loss) income | 111,797 | $ (304) | (41,293) | $ (6,099) |
Balance Sheet: |  |  |  |  |
Total assets | 2,902,014 |  | 2,902,014 |  | $ 288,351
Total liabilities | $ 581,615 |  | $ 581,615 |  | $ 28,105

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