Annual report pursuant to Section 13 and 15(d)

Long Term Debt - Amendment of Credit Agreement (Detail)

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Long Term Debt - Amendment of Credit Agreement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 28, 2017
Jun. 16, 2017
Dec. 15, 2016
Jun. 13, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]              
Debt Issue Cost Paid $ 330 [1] $ 521 [1] $ 2,446 [1] $ 783 [1] $ 29,815 $ 34,854  
Loss on Debt Amendment $ 331 [2] $ 190 [2] $ 161 [2] $ 249 [2] $ 521 $ 13,445 $ 925
Amended Credit Agreement June 13, 2016              
Debt Instrument [Line Items]              
Nature of Amendment         Reduced term loan interest rate by 0.25%    
Amended Credit Agreement December 15, 2016              
Debt Instrument [Line Items]              
Nature of Amendment         Reduced term loan interest rate by 0.50%    
Amended Credit Agreement June 16, 2017              
Debt Instrument [Line Items]              
Nature of Amendment         Reduced term loan interest rate by 0.25%; modified certain definitions and other provisions in the Credit Agreement    
Amended Credit Agreement November 28, 2017              
Debt Instrument [Line Items]              
Nature of Amendment         Extended maturity of revolving credit line to December 2022; reduced the interest rate applicable to borrowings under the credit line    
[1] Reflected as a reduction of long term debt on the consolidated balance sheet as of December 31, 2016 and 2017.
[2] Reflected as a loss on debt amendments and refinancing on the consolidated statement of income for the year in which the amendments were effective.