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Summary of Significant Accounting Policies - Schedule of Recognized Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues | $ 430,460 | $ 332,582
Leasing and Other Commissions [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 159,371 | 127,567
Capital Markets [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 101,364 | 77,391
Gains From Mortgage Banking Activities Origination Net [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 38,914 | 45,262
Management Services, Servicing Fees and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ 130,811 | $ 82,362

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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