Discontinued Operations Revenues and Components of Income Related to Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from operations of discontinued operations	$ 506	$ (5,540)	$ (1,935)
Income (loss) from discontinued operations	506	(5,540)	(1,935)
Ruckus and The Show
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	0	1,260	451
Income (loss) from operations of discontinued operations	506	(5,540)	(1,935)
Gain on disposal of discontinued operations	0	0	0
Income (loss) from discontinued operations	$ 506	$ (5,540)	$ (1,935)