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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Product licenses revenue $ 17,301 $ 22,646
Product support revenues 74,415 70,512
Sales and marketing expenses 51,335 39,582
Provision for income taxes (518) 4,259
Net income $ 1,673 $ 15,557
Diluted earnings per share [1] $ 0.15 $ 1.34
As Reported    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Product licenses revenue   $ 21,012
Product support revenues   70,490
Sales and marketing expenses   39,410
Provision for income taxes   3,465
Net income   $ 14,867
Diluted earnings per share   $ 1.28
Effect of the Adoption | ASU 2014-09    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Product licenses revenue   $ 1,634
Product support revenues   22
Sales and marketing expenses   172
Provision for income taxes   794
Net income   $ 690
Diluted earnings per share   $ 0.06
[1] Basic and fully diluted earnings per share for class A and class B common stock are the same.