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Revenues from Contracts with Customers - Schedule of Revenues from Contracts with Customers and Our Other Sources of Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue
Revenues from contracts with customers:	$ 415,403	$ 393,933
Revenues	503,980	483,930
Gains from mortgage banking activities/originations, net
Disaggregation of Revenue
Other sources of revenue	47,393	50,422
Servicing fees and other
Disaggregation of Revenue
Other sources of revenue	41,184	39,575
Leasing and other commissions
Disaggregation of Revenue
Revenues from contracts with customers:	147,433	140,439
Revenues	147,433	140,439
Capital markets commissions
Disaggregation of Revenue
Revenues from contracts with customers:	121,403	127,923
Management services
Disaggregation of Revenue
Revenues from contracts with customers:	$ 146,567	$ 125,571

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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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