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Acquisition of Business (Details)
$ in Thousands, CAD in Millions
12 Months Ended
Dec. 29, 2017
CAD
Dec. 29, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Aggregate principal amount of term loans provided     $ 824 $ 0 $ 0
Cumulative merger-related transaction costs     2,300    
Purchaser [Member]          
Business Acquisition [Line Items]          
Aggregate principal amount of term loans provided CAD 167.5 $ 131,600      
Loans receivable expected to be repaid prior to December 31, 2019     $ 800