Components of Income (Loss) from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations And Disposal Groups [Abstract]
Net revenues		$ 5,359	$ 1,276	$ 16,182
Discontinued operations:
Income (loss) from discontinued operations, net of income taxes of nil	(8)	(12,653)	87	(14,380)
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 (loss) from discontinued operations, net of income taxes	$ 2	$ (12,653)	$ 546	$ (14,380)