PROPERTY AND EQUIPMENT - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Impairment charge on internally developed software	$ 526,000
Assets retired	12,800,000	9,000,000	6,400,000
Assets retired, accumulated depreciation	$ 12,700,000	$ 8,900,000	$ 6,300,000