Lease Commitments - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Lease	Dec. 31, 2012 Lease
Operating Leased Assets [Line Items]
Rent Expense	$ 653,000	$ 647,000
cost of equipment under capital lease	96,000	120,000
Accumulated depreciation	55,000
Number of capital leases	0	4
Romeoville Illinois [Member]
Operating Leased Assets [Line Items]
Operating lease number of renewals	2
Operating lease extension period	5 years
Monthly rent on lease amounts	29
Burr Ridge Facility [Member]
Operating Leased Assets [Line Items]
Operating lease number of renewals	2
Operating lease extension period	1 year
Monthly rent on lease amounts	13
Offsite Warehouse [Member]
Operating Leased Assets [Line Items]
Monthly rent on lease amounts	$ 5