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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 543,614 $ 514,485 $ 1,048,683 $ 992,152
Office Furniture | Supplies-driven channel        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 223,457 203,096 414,685 382,060
Office Furniture | Contract channel        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 200,421 203,348 390,108 384,365
Hearth Products | Hearth        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 119,736 $ 108,041 $ 243,890 $ 225,727