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INCOME TAXES - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 27, 2017
Sep. 28, 2016
Sep. 27, 2017
Sep. 28, 2016
Dec. 28, 2016
Income Tax Contingency [Line Items]          
Effective income tax rate reconciliation (in percentage) 24.10% 26.50% 27.50% 26.60%  
Noncontrolling Interest, Ownership Percentage by Parent, Weighted Average 70.90% 66.10% 70.30% 61.50%  
Units acquired during the period (in shares)     1,009,727    
Deferred tax asset recognized as a result of investment in partnership     $ 9,883,000    
Deferred Tax Asset, Investment in Partnership $ 216,285,000   216,285,000    
Valuation allowance, deferred tax asset 15,679,000   15,679,000    
Deferred tax asset related to additional tax basis     5,216,000    
Uncertain tax positions $ 0   $ 0    
Percentage of tax benefits due to equity owners 85.00%   85.00%    
Tax Receivable Agreement Payments To Related Parties $ 0 $ 0 $ 1,471,000 $ 0  
Percentage of tax benefits expected to be realized 15.00%   15.00%    
Establishment of liabilities under tax receivable agreement     $ 12,918,000 $ 90,776,000  
Liabilities under tax receivable agreement $ 283,961,000   283,961,000   $ 272,482,000
Current portion of liabilities under tax receivable agreement $ 3,140,000   $ 3,140,000   $ 4,580,000
Redemption or Exchange of Units          
Income Tax Contingency [Line Items]          
Units acquired during the period (in shares)     685,800 4,706,663