Income Taxes-Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Accumed [Member]	Sep. 30, 2001 Accumed [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 71,700,000	$ 71,200,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	84,700,000	83,500,000
Operating Loss Carryforwards, Expiration Dates	2018	2017
Equity Method Investment, Ownership Percentage				100.00%
Operating Loss Carry Forwards Subject To Limitations	6,200,000
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	415,000
Operating Loss Carryforwards			2,200,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 500,000	$ 700,000
Percentage Of Income Tax Realized Upon Ultimate Settlement	50.00%