Condensed Consolidated Financial Statements - Revenues in Condensed Consolidated Statements of Operations from Arrangements for which Vendor-Specific Objective Evidence of Fair Value Does Not Exist for Each Undelivered Element (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue Recognition, Milestone Method [Line Items]
License	$ 39,577	$ 35,702
Maintenance	59,492	62,499
Services	23,497	22,588
Total revenues	232,817	221,473
Vendor Specific Objective Evidence of Fair Value [Member]
Revenue Recognition, Milestone Method [Line Items]
License	2,007	6,856
Maintenance	943	2,216
Services	103	8
Total revenues	$ 3,053	$ 9,080