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Revenue from Contracts with Customers - Summary of Revenues from Contracts with Customers and Other Sources of Revenues (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]
Revenue from contracts with customers	$ 796,874		$ 2,371,122
Principal transactions	73,360	$ 75,766	250,266	$ 241,869
Gains from mortgage banking activities/originations, net	51,972	45,455	132,764	164,263
Servicing fees	34,948	29,057	96,207	80,729
Interest income	15,946	11,726	37,060	40,909
Other revenues	4,154	1,171	6,557	3,023
Total revenues	977,254	827,028	2,893,976	2,459,122
Commissions [Member]
Revenue From Contracts With Customers [Line Items]
Revenue from contracts with customers	671,318		1,998,237
Real Estate Management And Other Services [Member]
Revenue From Contracts With Customers [Line Items]
Revenue from contracts with customers	101,881	60,798	305,880	163,017
Data, Software And Post-Trade [Member]
Revenue From Contracts With Customers [Line Items]
Revenue from contracts with customers	16,547	13,776	47,016	40,185
Fees From Related Parties [Member]
Revenue From Contracts With Customers [Line Items]
Revenue from contracts with customers	$ 7,128	$ 7,173	$ 19,989	$ 20,129

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Revenue from contracts with customers.

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Contractually specified servicing fees, ancillary fees, escrow interest and placement fees earned in exchange for servicing financial assets.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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Amount of revenue and income classified as other.

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Amount of realized and unrealized gain (loss) resulting from the difference between acquisition price and selling price or fair value of trading assets and trading liabilities, and from the firm's direct investment activity, conducted separately from customer trading activities, including, but not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships.

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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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