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Certain Balance Sheet Accounts - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Total property and equipment $ 77,498 $ 76,163
Less accumulated depreciation 53,604 48,594
Total 23,894 27,569
Computers and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Total property and equipment 17,137 18,177
Computer Software [Member]    
Property Plant And Equipment [Line Items]    
Total property and equipment 26,686 23,899
Furniture and Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Total property and equipment 8,471 8,527
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 25,204 $ 25,560