Segment Information (Revenue by Geographic Region) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Geographic Reporting Disclosure [Line Items]
Revenue	$ 48,958	[1]	$ 59,088	[1]	$ 155,601	[1]	$ 191,578	[1]
United States
Geographic Reporting Disclosure [Line Items]
Revenue	21,039		29,101		70,525		89,529
Europe
Geographic Reporting Disclosure [Line Items]
Revenue	8,750		12,470		29,278		43,021
Rest of World
Geographic Reporting Disclosure [Line Items]
Revenue	$ 19,169		$ 17,517		$ 55,798		$ 59,028

[1] quartersytd September 30, 2013 September 30, 2012September 30, 2013September 30, 2012Components of Revenue License Fees10,503 11,957$33,49441,137Service Revenue38,455 47,131122,107150,441Net Revenue48,958 59,088$155,601191,578