Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013 Goodwill
Goodwill [Line Items]
Balance as of beginning of period	$ 36,869		$ 37,463
Purchase price adjustments to goodwill retroactively applied	(594)	[1]
Balance as of end of period	$ 36,869		$ 37,463

[1] The purchase price adjustments identified during the first quarter of 2014 have been retroactively applied as of December 31, 2013.