Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 01, 2007
Income Tax Disclosure [Abstract]
Beginning Balance	$ 619,000	$ 435,000	$ 483,000	$ 0
Addition based on tax positions related to current year	441,000	89,000	94,000
Subtractions based on tax positions related to prior year			(142,000)
Additions based on tax positions related to prior year	428,000	95,000
Ending Balance	$ 1,488,000	$ 619,000	$ 435,000	$ 0