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Accounts Payable and Accrued Expenses (Accounts Payable and Accrued Expenses) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounts Payable and Accrued Liabilities [Abstract] |  |
Trade payables and accrued expenses | $ 22,608 | $ 19,017
Sales commissions payable | 13,186 | 10,626
Dividends payable | 13,719 | 9,137
Accrued payroll and related taxes | 10,409 | 8,309
Coach incentive accruals | 5,598 | 5,546
Promotional sales incentive accruals | 4,818 | 3,817
Deferred revenue | 4,333 | 2,797
Sales tax payable | 1,549 | 1,074
Total | $ 76,220 | $ 60,323

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