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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 1,768 $ 3,760
Deferred subscription services revenue, Current 13,508 17,324
Deferred product support revenue, Current 152,501 168,185
Deferred other services revenue, Current 8,763 9,465
Total current deferred revenue and advance payments 176,540 198,734
Deferred product licenses revenue, Non-current 542 820
Deferred subscription services revenue, Non-current 2,384 126
Deferred product support revenue, Non-current 3,091 4,826
Deferred other services revenue, Non-current 452 628
Total non-current deferred revenue and advance payments $ 6,469 $ 6,400