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Property, Equipment and Leasehold Improvements - Schedule of Property, Equipment and Leasehold Improvements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Abstract]    
Computer & related equipment $ 196,322 $ 200,592
Furniture & fixtures 10,447 10,591
Leasehold improvements 50,866 51,128
Work-in-process 3,728 3,406
Subtotal 261,363 265,717
Accumulated depreciation and amortization (178,618) (171,280)
Property, equipment and leasehold improvements, net $ 82,745 $ 94,437