Deferred Revenue and Advance Payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Deferred product licenses revenue, Current	$ 10,927	$ 14,538
Deferred subscription services revenue, Current	16,018	10,923
Deferred product support revenue, Current	168,833	167,771
Deferred other services revenue, Current	10,564	17,056
Gross current deferred revenue and advance payments	206,342	210,288
Less: unpaid deferred revenue	(97,929)	(96,632)
Net current deferred revenue and advance payments	108,413	113,656
Deferred product licenses revenue, Non-current	8,012	4,401
Deferred subscription services revenue, Non-current	750	1,161
Deferred product support revenue, Non-current	7,505	5,877
Deferred other services revenue, Non-current	1,047	1,175
Gross non-current deferred revenue and advance payments	17,314	12,614
Less: unpaid deferred revenue	(6,496)	(3,644)
Net non-current deferred revenue and advance payments	$ 10,818	$ 8,970