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Accounts Payable and Accrued Expenses (Accounts Payable and Accrued Expenses) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts Payable and Accrued Liabilities [Abstract] |  |
Trade payables and accrued expenses | $ 35,767 | $ 22,608
Sales commissions payable | 22,598 | 13,186
Dividends payable | 13,831 | 13,719
Accrued payroll and related taxes | 16,948 | 10,409
Coach incentive accruals | 325 | 5,598
Promotional sales incentive accruals | 7,621 | 4,818
Deferred revenue | 7,606 | 4,333
Sales tax payable | 2,981 | 1,549
Total | $ 107,677 | $ 76,220

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