Discontinued Operations - Summary of Activity for Discontinued Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenue from discontinued operations	$ 0	$ 1	$ 3,151
Operating (loss) income before taxes	0	(86)	(460)
Income tax benefit from discontinued operations	0	34	184
Gain on disposal, before taxes	0	0	803
Income tax expense on disposal	0	0	(321)
(Loss) income from discontinued operations	$ 0	$ (52)	$ 206