Corporate Borrowings and Capital Lease Obligations (Detail)			12 Months Ended
	Jun. 28, 2011 USD ($)	Dec. 28, 2006 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)	Mar. 21, 2016 USD ($)	Mar. 20, 2016 USD ($)
Debt Instrument [Line Items]
Unamortized loan fees(a)			$ (576,000)	$ (636,000)
Long-term debt			36,577,000
Sale leaseback transaction, gross proceeds	$ 7,335,000
Sale leaseback transaction, monthly rental payments	$ 110,000
Sale leaseback transaction, lease terms	60 months
Leveraged leases, net investment in leveraged leases disclosure, residual value of leased assets						$ 1,328,000
Sale leaseback transaction, imputed interest rate		4.90%
Sale leaseback transaction, gross proceeds		$ 7,000,000
Operating leases, rent expense			2,561,000	$ 2,283,000	$ 2,241,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 95,000,000
Periodic installment			250,000
Maximum aggregate acquisition allowable, amount			$ 35,000,000
Credit facility covenant, fixed charge coverage ratio			1.25
Credit facility covenant, excess availability from fixed charge coverage (less than) (as a percent)			17.50%
Long-term debt			$ 33,677,000
Remaining borrowing capacity			$ 51,588,000
Credit Agreement, interest rate (as a percent)			2.66%
Previous Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum individual acquisition allowable, amount			$ 1,000,000
Maximum aggregate acquisition allowable, amount			$ 7,500,000
Credit facility covenant, fixed charge coverage ratio			1.10
Previous Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 80,000,000
Term Loan [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Term loan face amount			$ 15,000,000				$ 15,000,000
Long-term debt			13,000,000
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt			34,253,000
Line of Credit [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount outstanding			15,424,000
Line of Credit [Member] | Credit Agreement [Member] | Fixed Asset Sub Line Facility [Member]
Debt Instrument [Line Items]
Amount outstanding			$ 5,253,000