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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 3,064 $ 3,760
Deferred subscription services revenue, Current 16,742 17,324
Deferred product support revenue, Current 173,156 168,185
Deferred other services revenue, Current 8,756 9,465
Total current deferred revenue and advance payments 201,718 198,734
Deferred product licenses revenue, Non-current 843 820
Deferred subscription services revenue, Non-current 385 126
Deferred product support revenue, Non-current 3,854 4,826
Deferred other services revenue, Non-current 586 628
Total non-current deferred revenue and advance payments $ 5,668 $ 6,400