Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Right-of-use assets		$ 5,901	$ 0
Lease liabilities		6,131
Concentration of Credit Risk
Expense for bad debts		0	23,008	$ 0
Deductions from allowance for doubtful accounts, net of recoveries		$ 300	500	700
Inventories
Percentage of LIFO Inventory		40.00%
Cost valuation of inventory if FIFO had been used exclusively		$ 4,400	5,100
LIFO inventories increased (decreased) cost of sales		(700)	(500)	100
Cash and Cash Equivalents
Accrued capital expenditures excluded from investing activities		600	1,100	600
Selling Expense [Member]
Concentration of Credit Risk
Expense for bad debts		$ 600	$ 700	$ 700
Canada [Member] | Sales [Member] | Customer Concentration Risk [Member]
Concentration of Credit Risk
Concentration risk percentage		4.70%	4.10%	2.40%
Maximum [Member] | Sales [Member] | Customer Concentration Risk [Member]
Concentration of Credit Risk
Concentration risk percentage		10.00%
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		$ 79,000	$ 76,800
ASU 2016-02 [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Right-of-use assets	$ 5,900	$ 5,901
Lease liabilities	6,200
Cumulative-effect transition adjustment to opening retained earnings (deficit)	$ 900