Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013 Previously Reported
Goodwill [Line Items]
Balance as of beginning of period	$ 40,329		$ 37,463
Purchase price adjustments to goodwill retroactively applied	2,866	[1]
Goodwill acquired	134
Balance as of end of period	$ 40,463		$ 37,463

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