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Revenue from Contracts with Customers - Schedule of Unaudited Condensed Consolidated Statement of Operations Impact of ASC Topic 606 (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue From Contracts With Customers [Line Items]
Revenues	$ 796,874		$ 2,371,122
Total Compensation and employee benefits	585,784	$ 543,591	1,816,402	$ 1,600,005
Other expenses	69,706	55,600	204,604	148,262
Total expenses	868,314	774,972	2,627,731	2,267,118
Commissions [Member]
Revenue From Contracts With Customers [Line Items]
Revenues	671,318		1,998,237
Real Estate Management And Other Services [Member]
Revenue From Contracts With Customers [Line Items]
Revenues	101,881	$ 60,798	305,880	$ 163,017
Revenue [Member] | ASC Topic 606 Impact [Member]
Revenue From Contracts With Customers [Line Items]
Revenues	32,518		96,763
Total Compensation and employee benefits	5,824		16,304
Other expenses	21,072		63,937
Total expenses	26,896		80,241
Revenue [Member] | Commissions [Member] | ASC Topic 606 Impact [Member]
Revenue From Contracts With Customers [Line Items]
Revenues	11,446		32,826
Revenue [Member] | Real Estate Management And Other Services [Member] | ASC Topic 606 Impact [Member]
Revenue From Contracts With Customers [Line Items]
Revenues	$ 21,072		$ 63,937

X

- Definition

The aggregate amount of expenditures for salaries, wages, profit sharing and incentives compensation, and other employee benefits, including share-based compensation and the expense related to allocation of income to limited partnership units and founding/working partner units.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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Amount of expense classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4,6)
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 606
-SubTopic 10
-Section 50
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