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Segment and Geographic Information - Segment Reporting Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Brokerage revenues: |  |
Rates | $ 160,772 | $ 135,752
Credit | 82,050 | 81,870
Foreign exchange | 99,050 | 80,026
Energy and commodities | 60,149 | 53,145
Equities, insurance, and other asset classes | 97,754 | 75,706
Leasing and other services | 159,378 | 127,574
Real estate capital markets | 101,364 | 77,390
Gains from mortgage banking activities/originations, net | 38,914 | 45,261
Real estate management and other services | 96,878 | 50,630
Servicing fees | 28,926 | 24,832
Fees from related parties | 6,590 | 6,938
Data, software and post-trade | 15,099 | 13,087
Other revenues | 974 | 976
Total non-interest revenues | 947,898 | 773,187
Interest income | 8,748 | 10,006
Total revenues | 956,646 | 783,193
Interest expense | 27,138 | 18,763
Non-interest expenses | 836,057 | 712,450
Total expenses | 863,195 | 731,213
Other income (losses), net: |  |
Gain (loss) on divestiture and sale of investments |  | 557
Gains (losses) on equity investments | 5,801 | 237
Other income (losses) | 33,942 | 5,020
Total other income (losses), net | 39,743 | 5,814
Income (loss) from operations before income taxes | 133,194 | 57,794
Corporate Items [Member] |  |
Brokerage revenues: |  |
Fees from related parties | 6,299 | 6,565
Other revenues | 13 | 30
Total non-interest revenues | 6,312 | 6,595
Interest income | 1,842 | 1,700
Total revenues | 8,154 | 8,295
Interest expense | 23,446 | 16,889
Non-interest expenses | 80,809 | 79,252
Total expenses | 104,255 | 96,141
Other income (losses), net: |  |
Gain (loss) on divestiture and sale of investments |  | 557
Gains (losses) on equity investments | 2,625 | 237
Other income (losses) | 20,574 | 372
Total other income (losses), net | 23,199 | 1,166
Income (loss) from operations before income taxes | (72,902) | (86,680)
Financial Services [Member] | Operating Segments [Member] |  |
Brokerage revenues: |  |
Rates | 160,772 | 135,752
Credit | 82,050 | 81,870
Foreign exchange | 99,050 | 80,026
Energy and commodities | 60,149 | 53,145
Equities, insurance, and other asset classes | 97,754 | 75,706
Data, software and post-trade | 15,099 | 13,087
Other revenues | 913 | 942
Total non-interest revenues | 515,787 | 440,528
Interest income | 834 | 650
Total revenues | 516,621 | 441,178
Non-interest expenses | 403,821 | 353,906
Total expenses | 403,821 | 353,906
Other income (losses), net: |  |
Other income (losses) | 10,935 | 4,648
Total other income (losses), net | 10,935 | 4,648
Income (loss) from operations before income taxes | 123,735 | 91,920
Real Estate Services [Member] | Operating Segments [Member] |  |
Brokerage revenues: |  |
Leasing and other services | 159,378 | 127,574
Real estate capital markets | 101,364 | 77,390
Gains from mortgage banking activities/originations, net | 38,914 | 45,261
Real estate management and other services | 96,878 | 50,630
Servicing fees | 28,926 | 24,832
Fees from related parties | 291 | 373
Other revenues | 48 | 4
Total non-interest revenues | 425,799 | 326,064
Interest income | 6,072 | 7,656
Total revenues | 431,871 | 333,720
Interest expense | 3,692 | 1,874
Non-interest expenses | 351,427 | 279,292
Total expenses | 355,119 | 281,166
Other income (losses), net: |  |
Gains (losses) on equity investments | 3,176 |
Other income (losses) | 2,433 |
Total other income (losses), net | 5,609 |
Income (loss) from operations before income taxes | $ 82,361 | $ 52,554

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- Definition Brokerage revenue from equity products, Insurance and other asset classes, including cash equities, equity derivatives (both listed and OTC), equity index futures, options on equity products, commodities and energy derivatives. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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