Intangible and Other Assets, Net - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012 Year	Mar. 31, 2011 Year
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, amortization expense	$ 169,000	$ 214,000
Finite lived intangible assets, Weighted average amortization period	14.3	14.8