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Acquisitions - Summary of Preliminary Allocation of Purchase Price for Acquisitions of Acquiree (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 11, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 3,636,495   $ 3,549,212
Citigroup's Alternative Investor Services [Member]      
Business Acquisition [Line Items]      
Accounts receivable   $ 57,789  
Fixed assets   92  
Other assets   1,856  
Goodwill   99,494  
Deferred revenue   (3,910)  
Other liabilities assumed   (6,563)  
Consideration paid, net of cash acquired   317,958  
Citigroup's Alternative Investor Services [Member] | Acquired Client Relationships and Contracts [Member]      
Business Acquisition [Line Items]      
Acquired client relationships and contracts   124,600  
Citigroup's Alternative Investor Services [Member] | Completed Technology [Member]      
Business Acquisition [Line Items]      
Acquired client relationships and contracts   $ 44,600