Future Minimum Rental Commitments Required under Operating Leases (Detail) (USD $)	Sep. 30, 2012
Operating Leased Assets [Line Items]
2013	$ 1,903,000
2014	1,699,000
2015	1,301,000
2016	1,131,000
2017	1,132,000
Thereafter	4,325,000
Operating Leases, Future Minimum Payments Due, Total	11,491,000
Less sublease rentals	(2,877,000)
Operating Leases Future Minimum Payments Due Net, Total	$ 8,614,000