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Basis of Presentation and Summary of Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Schedule Of Significant Accounting Policies [Line Items]
Restructuring expenses	$ 608,000	$ 406,000
Accounts Payable and Accrued Liabilities, Current	0
Percentage of total annual net sales in the third and fourth quarters			62.00%	60.00%
Operating Lease, Right-of-Use Asset	91,837,000
Operating Lease, Liability	107,075,000
Cost of depreciation	300,000
Restructuring Charges [Member]
Schedule Of Significant Accounting Policies [Line Items]
Restructuring expenses	400,000
Additional Restructuring and Integration Charges [Member]
Schedule Of Significant Accounting Policies [Line Items]
Restructuring expenses	1,200,000
Receivables Purchase Agreement [Member]
Schedule Of Significant Accounting Policies [Line Items]
Sale of receivables	25,100,000	19,600,000
Receivables Purchase Agreement [Member] \| Selling, general and administrative expenses
Schedule Of Significant Accounting Policies [Line Items]
Charge related to sale of receivables	147,500	90,000
Accounting Standards Update 2016-02 [Member]
Schedule Of Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset					$ 90,900,000
Operating Lease, Liability					$ 104,400,000
Employee severance
Schedule Of Significant Accounting Policies [Line Items]
Restructuring expenses	300,000	$ 400,000
Restructuring reserve	$ 1,300,000