Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
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