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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 611,120 $ 599,455 $ 1,659,803 $ 1,591,607
Office Furniture | Supplies-driven channel        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 265,971 238,542 680,656 620,602
Office Furniture | Contract channel        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 205,716 226,770 595,824 611,135
Hearth Products | Hearth        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 139,433 $ 134,143 $ 383,323 $ 359,870