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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 11,113 $ 13,023
Deferred subscription services revenue, Current 17,324 18,303
Deferred product support revenue, Current 168,043 162,781
Deferred other services revenue, Current 9,465 10,015
Gross current deferred revenue and advance payments 205,945 204,122
Less: unpaid deferred revenue, Current (93,296) (98,587)
Net current deferred revenue and advance payments 112,649 105,535
Deferred product licenses revenue, Non-current 7,169 9,118
Deferred subscription services revenue, Non-current 126 1,307
Deferred product support revenue, Non-current 4,826 5,751
Deferred other services revenue, Non-current 628 690
Gross non-current deferred revenue and advance payments 12,749 16,866
Less: unpaid deferred revenue, Non-current (2,568) (2,951)
Net non-current deferred revenue and advance payments $ 10,181 $ 13,915