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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Accounts receivable, allowances $ 1,861 $ 1,700
Property, equipment and leasehold improvements, accumulated depreciation and amortization 177,562 171,280
Intangible assets, accumulated amortization $ 519,640 $ 507,612
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 750,000,000 750,000,000
Common stock, shares issued 129,953,761 129,543,856
Common stock, shares outstanding 89,859,658 90,104,885
Treasury shares 40,094,103 39,438,971