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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenue | $ 484,499 | $ 296,470 | $ 1,066,994 | $ 896,510
Operating income (loss) | 125,648 | (2,348) | 360,423 | (27,095)
Net income (loss) | 78,357 | 77,120 | 308,691 | (101,688)
Global Investment Management [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenue | 418,028 | 221,245 | 902,932 | 728,144
Operating income (loss) | 93,491 | (26,625) | 155,869 | (107,351)
Net income (loss) | 52,477 | 56,182 | 118,348 | (175,014)
Development Services [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenue | 26,179 | 22,690 | 57,255 | 42,265
Operating income (loss) | 26,027 | 13,316 | 184,136 | 54,664
Net income (loss) | 19,745 | 9,812 | 169,837 | 47,299
Other [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenue | 40,292 | 52,535 | 106,807 | 126,101
Operating income (loss) | 6,130 | 10,961 | 20,418 | 25,592
Net income (loss) | $ 6,135 | $ 11,126 | $ 20,506 | $ 26,027

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- Definition This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include operating profit/loss. + References No definition available. + Details
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