Obligations Under Non Cancelable Operating Leases (Detail) (USD $)	Dec. 31, 2012
Schedule of Operating Leases [Line Items]
December 31, 2013	$ 2,222,000
December 31, 2014	2,222,000
December 31, 2015	2,222,000
December 31, 2016	2,222,000
December 31, 2017	1,655,000
Thereafter	5,611,000
Minimum lease payments	$ 16,154,000