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Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |  |
Bad debt reserves | $ 1,000,000 | $ 400,000 |
Accounts receivable reserves for returns and other deductions | 6,100,000 | 5,900,000 |
Estimated value of obsolete or slow-moving inventory | 700,000 | 1,200,000 |
Advertising expense | 15,500,000 | 16,400,000 | $ 15,300,000
Accumulated amortization of media library | $ 15,800,000 | $ 14,500,000 |
Defined contribution plan percentage employee's matching contribution | 50.00% |  |
Defined contribution plan maximum annual matching contribution amount | $ 1,500 |  |
Common stock shares excluded from computation of dilutive earnings per share | 954,000 | 725,000 | 1,440,000
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 3 years |  |
Estimated useful life of media library | 5 years |  |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 45 years |  |
Estimated useful life of media library | 15 years |  |
Period for gross revenues from all sources to be earned | 7 years |  |
Media Titles and Rights |  |  |
Significant Accounting Policies [Line Items] |  |  |
2016 | $ 2,200,000 |  |
2017 | 1,500,000 |  |
2018 | 1,200,000 |  |
2019 | 1,000,000 |  |
2020 | 900,000 |  |
Defined Contribution Plan 401 (k) |  |  |
Significant Accounting Policies [Line Items] |  |  |
Defined contribution plan annual matching contribution amount | $ 200,000 | $ 200,000 | $ 300,000
Website development costs and other software |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 3 years |  |

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