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Assets Held for Sale - Additional Information (Detail) (USD $)	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale write-down	$ 1,200,000	$ 405,000	$ 1,100,000	$ 1,100,000	$ 500,000
Loss on the sale of the facility	757,000
Byron Center facility [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale write-down		165,000
Sales proceeds	3,600,000
Loss on the sale of the facility	757,000
River Grove facility [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale write-down		$ 240,000

The difference between the proceeds received and the carrying value of the long-lived asset. If the proceeds received exceeds the carrying value of the long-lived asset, then there is a gain. If the proceeds received is less than the carrying value of the long-lived asset, then there is a loss.

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