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Net Sales to Major Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 03, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue, Major Customer [Line Items]                      
Net Sales $ 136,628 $ 262,413 $ 119,565 $ 94,505 $ 167,026 $ 302,791 $ 140,977 $ 95,809 $ 613,111 $ 706,603 $ 745,741
Wal-Mart                      
Revenue, Major Customer [Line Items]                      
Net Sales                 156,436 186,894 180,758
Target                      
Revenue, Major Customer [Line Items]                      
Net Sales                 108,799 110,233 96,850
Toys 'R' Us                      
Revenue, Major Customer [Line Items]                      
Net Sales                 69,508 90,568 96,446
Major Customer                      
Revenue, Major Customer [Line Items]                      
Net Sales                 $ 334,743 $ 387,695 $ 374,054
Net Sales | Customer Concentration Risk                      
Revenue, Major Customer [Line Items]                      
Percentage of Net Sales from major customer                 54.60% 54.90% 50.20%
Net Sales | Wal-Mart | Customer Concentration Risk                      
Revenue, Major Customer [Line Items]                      
Percentage of Net Sales from major customer                 25.50% 26.50% 24.30%
Net Sales | Target | Customer Concentration Risk                      
Revenue, Major Customer [Line Items]                      
Percentage of Net Sales from major customer                 17.80% 15.60% 13.00%
Net Sales | Toys 'R' Us | Customer Concentration Risk                      
Revenue, Major Customer [Line Items]                      
Percentage of Net Sales from major customer                 11.30% 12.80% 12.90%