Intangible and Other Assets, Net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, amortization expense	$ 4,000	$ 728,000	$ 213,000	$ 1,300,000
Finite lived intangible assets, Weighted average amortization period			17 years	15 years 3 months 18 days
Impairment Of the carrying value of intangible asset			$ 4,800,000