Income Tax - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Operating expenses not currently deductible	$ 7,360	$ 5,372
Stock option and other employee benefit plans	7,089	6,097
Capital loss and credit carryforward	185	275
Property and equipment	149	570
Total deferred income tax assets	14,783	12,314
Intangible assets	(12,910)	(11,838)
Other	(173)	(153)
Total deferred income tax liabilities	(13,083)	(11,991)
Net deferred income tax asset	$ 1,700	$ 323