Components of Income (Loss) from Discontinued Operations (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Discontinued Operations And Disposal Groups [Abstract]
Net revenue	$ 1,276
Discontinued operations:
Income from discontinued operations before income taxes	62
Income from discontinued operations, net of income taxes	62
Gain on sale of discontinued operations, net of income taxes of nil	459
Income from discontinued operations, net of income taxes	$ 521