Discontinued Operations and Divestitures - Gain (loss) on Disposals of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]
Gain (loss) on disposal of discontinued operations, before income tax	$ 129	$ (11)	$ 129	$ (885)
Income tax (benefit) expense	(161)	16	(161)	(384)
Gain (loss) on disposal of discontinued operations, net of tax	$ 290	$ (27)	$ 290	$ (501)