Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Stranded tax effects reclassified from accumulated other comprehensive income to retained earnings	$ 300,000
Concentration of Credit Risk
Expense for bad debts	23,008,000	$ 0	$ 0
Deductions from allowance for doubtful accounts, net of recoveries	$ 500,000	700,000	400,000
Inventories
Percentage of LIFO Inventory	30.00%
Cost valuation of inventory if FIFO had been used exclusively	$ 5,100,000	5,600,000
LIFO inventories increased (decreased) cost of sales	(500,000)	(100,000)	100,000
Capitalized Computer Software, Gross	6,800,000	6,900,000
Capitalized Computer Software, Amortization	500,000	1,000,000	600,000
Cash and Cash Equivalents
Accrued capital expenditures excluded from investing activities	1,100,000	600,000	100,000
Selling Expense [Member]
Concentration of Credit Risk
Expense for bad debts	$ 700,000	$ 700,000	$ 800,000
Canada [Member] | Sales [Member] | Customer Concentration Risk [Member]
Concentration of Credit Risk
Concentration risk percentage	4.10%	2.40%	4.60%
Estimate of Fair Value, Fair Value Disclosure [Member] | Less unamortized deferred financing fees [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Notes payable, fair value disclosure	$ 76,800,000	$ 78,000,000
Maximum [Member] | Sales [Member] | Customer Concentration Risk [Member]
Concentration of Credit Risk
Concentration risk percentage	10.00%
ASU 2016-02 [Member] | Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Right-of-use assets	$ 5,700,000
Lease liabilities	5,700,000
ASU 2016-02 [Member] | Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Right-of-use assets	6,700,000
Lease liabilities	$ 6,700,000