Income Taxes - Schedule of Gross Unrecognized Tax Positions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Balance as of beginning of year	$ 4,602	$ 3,936	$ 4,128
Additions based on tax positions related to the current year	702	400	500
Additions based on tax position related to prior year	660	270	109
Decreases based on tax positions related to prior year	(9)	(4)	(801)
Balance as of end of year	$ 5,955	$ 4,602	$ 3,936