Property and Equipment, Net (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Depreciation	$ 2,600,000	$ 2,500,000	$ 7,800,000	$ 5,300,000
Loss from discontinued operations			0	1,986,000
Loss From Discontinued Operations, Net of Taxes [Member]
Loss from discontinued operations		$ 100,000