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Revenues from Contracts with Customers - Schedule of Condensed Consolidated Statements of Financial Condition Impact of ASC Topic 606 (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Accrued commissions and other receivables, net | $ 784,513 |  | $ 620,039
Total assets | 6,777,496 |  | 5,429,712
Liabilities |  |  |
Accrued compensation | 442,871 |  | 432,733
Accounts payable, accrued and other liabilities | 976,432 |  | 942,917
Total liabilities | 5,290,789 |  | $ 4,243,556
Revenue [Member] |  |  |
Assets |  |  |
Total assets |  | $ 64,400 |
Liabilities |  |  |
Total liabilities |  | $ 41,900 |
Revenue [Member] | Under Previous U.S. GAAP [Member] |  |  |
Assets |  |  |
Accrued commissions and other receivables, net | 706,060 |  |
Total assets | 6,699,043 |  |
Liabilities |  |  |
Accrued compensation | 405,477 |  |
Accounts payable, accrued and other liabilities | 959,152 |  |
Total liabilities | 5,236,115 |  |
Revenue [Member] | ASC Topic 606 Impact Increase (decrease) [Member] |  |  |
Assets |  |  |
Accrued commissions and other receivables, net | 78,453 |  |
Total assets | 78,453 |  |
Liabilities |  |  |
Accrued compensation | 37,394 |  |
Accounts payable, accrued and other liabilities | 17,280 |  |
Total liabilities | $ 54,674 |  |

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(1),(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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