Summary of Significant Accounting Policies (Detail2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property and Equipment
Accumulated depreciation	$ 49,083,000	$ 48,629,000
Operating loss carryforwards
Valuation allowance for deferred tax assets	10,404,000	10,360,000
State and Local Jurisdiction
Operating loss carryforwards
Increase in valuation allowances	44,000	1,805,000	(24,000)
State and Local Jurisdiction | Valuation Allowance, Operating Loss Carryforwards
Operating loss carryforwards
Valuation allowance for deferred tax assets	10,404,000
Increase in valuation allowances	$ 44,000