Acquisitions - Schedule of Total Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Goodwill	$ 176,350	$ 174,294	$ 140,807
Bitstream Inc [Member]
Business Acquisition [Line Items]
Cash, accounts receivable and other assets	1,136
Deferred tax asset, short term	1,732
Goodwill	30,397
Intangible assets	21,770
Accrued expenses and deferred revenue	(2,350)
Deferred tax liability, long term	(3,113)
Total purchase price	$ 49,572