Estimated Values of Gross Uncertain Tax Positions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	$ (301)	$ (134)	$ (356)
Additions based on tax positions related to the current year	(31)
Additions for tax positions of prior years	(164)	(167)	(76)
Settlements	145		298
Ending Balance	$ (351)	$ (301)	$ (134)