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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
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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%

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