Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Dec. 31, 2013 Previously Reported
Goodwill [Line Items]
Balance as of beginning of period	$ 43,469		$ 37,463
Purchase price adjustments to goodwill retroactively applied	6,006	[1]
Goodwill acquired	1,540
Balance as of end of period	$ 45,009		$ 37,463

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