Deferred Revenue and Advance Payments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Deferred Revenue Disclosure [Abstract]
Deferred product licenses revenue, Current	$ 11,401	$ 13,506
Deferred subscription services revenue, Current	12,820	15,763
Deferred product support revenue, Current	140,593	158,738
Deferred other services revenue, Current	9,226	9,149
Gross current deferred revenue and advance payments	174,040	197,156
Less: unpaid deferred revenue, Current	(58,414)	(96,461)
Net current deferred revenue and advance payments	115,626	100,695
Deferred product licenses revenue, Non-current	9,918	5,397
Deferred subscription services revenue, Non-current	1,594	2,138
Deferred product support revenue, Non-current	6,394	7,607
Deferred other services revenue, Non-current	763	795
Gross non-current deferred revenue and advance payments	18,669	15,937
Less: unpaid deferred revenue, Non-current	(3,518)	(6,942)
Net non-current deferred revenue and advance payments	$ 15,151	$ 8,995