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Summary of Significant Accounting Policies - Schedule of Recognized Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenues	$ 346,131	$ 279,833	$ 621,399	$ 540,568
Gains from mortgage banking activities/originations, net	45,091	41,877	76,437	80,791
Management services, servicing fees and other	160,256	144,909	301,298	275,720
Revenues	551,478	466,619	999,134	897,079
Leasing and Other Commissions [Member]
Disaggregation Of Revenue [Line Items]
Revenues	217,381	178,142	389,852	337,513
Capital Markets Commissions [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 128,750	$ 101,691	$ 231,547	$ 203,055

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Management services, servicing fees and other.

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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, 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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