Income Taxes - Additional Information (Detail) (USD $)			12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2012 Federal	Dec. 31, 2012 Post-apportionment state	Dec. 31, 2012 Pre-apportionment state New York
Schedule Of Income Taxes [Line Items]
Valuation allowance	$ 32,354,000	$ 31,432,000
Federal net operating loss carry forwards		75,700,000
NOLs carry forward lower range			2021	2013	2020
NOLs carry forward upper range			2032	2032	2032
State and local net operating loss		44,600,000
Deferred tax assets tax credit carry forwards		106,700,000
Deferred tax asset recognized		$ 0
Deferred tax assets net operating loss carry forwards, expiration period		20 years