Deferred Revenue and Advance Payments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Deferred product licenses revenue, Current	$ 11,125	$ 12,252
Deferred product support revenue, Current	149,280	145,343
Deferred subscription services revenue, Current	7,968	6,569
Deferred other services revenue, Current	14,612	15,650
Gross current deferred revenue and advance payments	182,985	179,814
Less: unpaid deferred revenue	(74,830)	(78,565)
Net current deferred revenue and advance payments	108,155	101,249
Deferred product licenses revenue, Non-current	3,306	3,280
Deferred product support revenue, Non-current	6,709	8,205
Deferred subscription services revenue, Non-current	792	696
Deferred other services revenue, Non-current	1,749	1,184
Gross non-current deferred revenue and advance payments	12,556	13,365
Less: unpaid deferred revenue	(3,102)	(4,542)
Net non-current deferred revenue and advance payments	$ 9,454	$ 8,823