Components of Income from Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Discontinued Operations And Disposal Groups [Abstract]
Net revenue		$ 1,276
Discontinued operations:
Income from discontinued operations, net of income taxes of nil	$ (8)	87
Adjustments to amounts reported previously for gain on sale of discontinued operations, net of income taxes of nil	(3)	(57)
Gain on sale of discontinued operations, net of income taxes of nil	13	516
Income from discontinued operations, net of income taxes	$ 2	$ 546