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Interest Rate Swaps in Effect (Detail) (USD $)
9 Months Ended
Oct. 01, 2011
Interest Rate Swap 1
 
Debt Disclosure [Line Items] 
Notional Amount$ 15,000,000
Fixed Interest Rate1.22%
Effective DateNov. 23, 2009
Maturity DateNov. 23, 2011
Interest Rate Swap 2
 
Debt Disclosure [Line Items] 
Notional Amount20,000,000
Fixed Interest Rate1.80%
Effective DateNov. 23, 2009
Maturity DateNov. 23, 2012
Interest Rate Swap 3
 
Debt Disclosure [Line Items] 
Notional Amount20,000,000
Fixed Interest Rate1.56%
Effective DateMar. 11, 2010
Maturity DateDec. 11, 2012
Interest Rate Swap 4
 
Debt Disclosure [Line Items] 
Notional Amount10,000,000
Fixed Interest Rate1.12%
Effective DateMar. 11, 2010
Maturity DateMar. 11, 2012
Interest Rate Swap 5
 
Debt Disclosure [Line Items] 
Notional Amount15,000,000
Fixed Interest Rate0.95%
Effective DateAug. 06, 2010
Maturity DateDec. 06, 2012
Interest Rate Swap 6
 
Debt Disclosure [Line Items] 
Notional Amount25,000,000
Fixed Interest Rate1.61%
Effective DateFeb. 23, 2011
Maturity DateFeb. 24, 2014
Interest Rate Swap 7
 
Debt Disclosure [Line Items] 
Notional Amount25,000,000
Fixed Interest Rate2.52%
Effective DateFeb. 23, 2011
Maturity DateFeb. 23, 2016
Interest Rate Swap 8
 
Debt Disclosure [Line Items] 
Notional Amount25,000,000
Fixed Interest Rate0.975%
Effective DateJul. 18, 2011
Maturity DateJul. 18, 2014
Interest Rate Swap 9
 
Debt Disclosure [Line Items] 
Notional Amount15,000,000
Fixed Interest Rate1.15%
Effective DateSep. 12, 2011
Maturity DateSep. 12, 2016
Interest Rate Swap 10
 
Debt Disclosure [Line Items] 
Notional Amount$ 15,000,000
Fixed Interest Rate0.62%
Effective DateSep. 12, 2011
Maturity DateSep. 11, 2014