Business Segments, Geographic Data, and Sales by Major Customers - Net Sales to Major Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, Major Customer [Line Items]
Net sales	$ 152,511	$ 280,130	$ 95,182	$ 70,826	$ 132,326	$ 236,699	$ 105,781	$ 93,004	$ 598,649	$ 567,810	$ 613,111
Wal-Mart
Revenue, Major Customer [Line Items]
Net sales									177,063	143,587	156,436
Target
Revenue, Major Customer [Line Items]
Net sales									124,709	122,141	108,799
Toys R Us
Revenue, Major Customer [Line Items]
Net sales											69,508
Major Customer
Revenue, Major Customer [Line Items]
Net sales									$ 301,772	$ 265,728	$ 334,743
Net Sales | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer									50.40%	46.80%	54.60%
Net Sales | Wal-Mart | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer									29.60%	25.30%	25.50%
Net Sales | Target | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer									20.80%	21.50%	17.80%
Net Sales | Toys R Us | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer											11.30%