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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
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Equity Method Investments [Line Items]
Revenue	$ 392,945	$ 384,142	$ 1,181,174	$ 1,008,206
Operating income (loss)	522,989	98,929	895,378	379,653
Net income	455,887	186,294	711,711	430,501
Global Investment Management [Member]
Schedule Of Equity Method Investments [Line Items]
Revenue	305,829	308,221	931,116	813,279
Operating income (loss)	329,982	(59,677)	607,344	32,211
Net income	281,580	36,937	454,871	101,334
Development Services [Member]
Schedule Of Equity Method Investments [Line Items]
Revenue	34,582	29,273	88,587	78,276
Operating income (loss)	188,470	152,102	271,607	329,959
Net income	170,387	141,489	240,700	307,641
Other [Member]
Schedule Of Equity Method Investments [Line Items]
Revenue	52,534	46,648	161,471	116,651
Operating income (loss)	4,537	6,504	16,427	17,483
Net income	$ 3,920	$ 7,868	$ 16,140	$ 21,526

X

- 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.

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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

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-Publisher FASB
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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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