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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sales Returns and Allowances, Goods, Total $ 323,000 $ 290,000  
Allowance for Doubtful Accounts Receivable 94,000 64,000  
Advertising Expense $ 15,000,000 $ 17,000,000 $ 21,000,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 69,375 67,375 0