Deferred Revenue and Advance Payments (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred Revenue Disclosure [Abstract]
Deferred product licenses revenue, Current	$ 11,305	$ 13,023
Deferred subscription services revenue, Current	18,139	18,303
Deferred product support revenue, Current	167,933	162,781
Deferred other services revenue, Current	9,210	10,015
Gross current deferred revenue and advance payments	206,587	204,122
Less: unpaid deferred revenue, Current	(74,540)	(98,587)
Net current deferred revenue and advance payments	132,047	105,535
Deferred product licenses revenue, Non-current	8,455	9,118
Deferred subscription services revenue, Non-current	961	1,307
Deferred product support revenue, Non-current	6,595	5,751
Deferred other services revenue, Non-current	760	690
Gross non-current deferred revenue and advance payments	16,771	16,866
Less: unpaid deferred revenue, Non-current	(4,137)	(2,951)
Net non-current deferred revenue and advance payments	$ 12,634	$ 13,915