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Net Sales to Major Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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%

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