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Property, Equipment and Leasehold Improvements - Schedule of Property, Equipment and Leasehold Improvements (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Property Plant And Equipment [Abstract]    
Computer & related equipment $ 160,946 $ 143,499
Furniture & fixtures 10,134 9,870
Leasehold improvements 47,924 47,579
Work-in-process 13,492 12,658
Subtotal 232,496 213,606
Accumulated depreciation and amortization (133,237) (114,680)
Property, equipment and leasehold improvements, net $ 99,259 $ 98,926