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Operating Leases - Schedule of Rental Expenses Under Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Operating Leases, Rent Expense, Net [Abstract]      
Minimum rentals $ 33,032us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 30,234us-gaap_OperatingLeasesRentExpenseMinimumRentals $ 26,195us-gaap_OperatingLeasesRentExpenseMinimumRentals
Contingent rentals 1,765us-gaap_OperatingLeasesRentExpenseContingentRentals 1,640us-gaap_OperatingLeasesRentExpenseContingentRentals 1,452us-gaap_OperatingLeasesRentExpenseContingentRentals
Less: sublease rentals (94)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (94)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 (96)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Total $ 34,703us-gaap_OperatingLeasesRentExpenseNet $ 31,780us-gaap_OperatingLeasesRentExpenseNet $ 27,551us-gaap_OperatingLeasesRentExpenseNet