Business Segments, Geographic Data, and Sales by Major Customers - Net Sales to Major Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 280,130	$ 236,699	$ 446,138	$ 435,484
Net Sales | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Net sales	$ 142,519	$ 114,930	$ 220,532	$ 194,985
Percentage of Net Sales from major customer	50.90%	48.60%	49.40%	44.70%
Net Sales | Wal-Mart | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Net sales	$ 78,347	$ 64,133	$ 130,165	$ 107,344
Percentage of Net Sales from major customer	28.00%	27.10%	29.20%	24.60%
Net Sales | Target | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Net sales	$ 64,172	$ 50,797	$ 90,367	$ 87,641
Percentage of Net Sales from major customer	22.90%	21.50%	20.20%	20.10%