Business Segments, Geographic Data, Sales by Product Group and Major Customers - Net Sales to Major Customers (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Major Customer [Line Items]
Net sales	$ 132,326	$ 236,699	$ 105,781	$ 93,004	$ 136,628	$ 262,413	$ 119,565	$ 94,505	$ 567,810	$ 613,111	$ 706,603
Wal-Mart
Revenue, Major Customer [Line Items]
Net sales									143,587	156,436	186,894
Target
Revenue, Major Customer [Line Items]
Net sales									122,141	108,799	110,233
Toys R Us
Revenue, Major Customer [Line Items]
Net sales										69,508	90,568
Major Customer
Revenue, Major Customer [Line Items]
Net sales									$ 265,728	$ 334,743	$ 387,695
Net Sales | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer									46.80%	54.60%	54.90%
Net Sales | Wal-Mart | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer									25.30%	25.50%	26.50%
Net Sales | Target | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer									21.50%	17.80%	15.60%
Net Sales | Toys R Us | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Percentage of Net Sales from major customer										11.30%	12.80%