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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