Discontinued Operations - Summary of Activity for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]
Revenue from discontinued operations	$ 44	$ 917	$ 438	$ 3,045
Operating loss before income taxes	(71)	(165)	(254)	(364)
Income tax benefit from discontinued operations	27	62	96	136
(Loss) gain on disposal, before income taxes	(22)	57	85	181
Income tax benefit (expense) on disposal	9	(21)	(32)	(67)
Loss from discontinued operations	$ (57)	$ (67)	$ (105)	$ (114)