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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2017
Jun. 30, 2017
Jun. 30, 2014
Jul. 31, 2013
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 31, 2016
Sep. 30, 2012
Significant Accounting Policies [Line Items]                          
Long term debt, face amount               $ 156,647,000 $ 156,647,000 $ 206,865,000      
Long term debt, current               21,200,000 21,200,000        
Depreciation expense                 13,000,000 13,900,000 $ 10,900,000    
Advertising expenses                 10,800,000 20,100,000 15,800,000    
Impairment charge                 5,248,000 0 0    
Goodwill impairment         $ 8,300,000       8,288,000 0      
Restricted stock compensation expense                 $ 3,112,000 1,621,000 1,562,000    
Prepaid forward contract, settlement year                 2020        
Payment for repurchase of convertible notes                 $ 35,614,000 8,035,000      
Repurchase of common stock under prepaid forward repurchase agreement, shares     3,112,840                    
Repurchase of common stock, average price per share     $ 7.71                    
Payment for repurchase of common stock     $ 24,000,000             $ 13,506,000 $ 13,193,000    
Trademarks and Trade Names                          
Significant Accounting Policies [Line Items]                          
Impairment charge                 $ 2,300,000        
Convertible Senior Notes                          
Significant Accounting Policies [Line Items]                          
Potentially dilutive securities excluded from computation of diluted earnings per common share                 18,272,906 23,004,916 0    
Options and Warrants                          
Significant Accounting Policies [Line Items]                          
Potentially dilutive securities excluded from computation of diluted earnings per common share                 1,062,500 1,500,000 1,518,596    
Restricted Stock                          
Significant Accounting Policies [Line Items]                          
Potentially dilutive securities excluded from computation of diluted earnings per common share                 0 0 0    
Minimum                          
Significant Accounting Policies [Line Items]                          
Discount on invoiced amount of products                 2.00%        
Maximum                          
Significant Accounting Policies [Line Items]                          
Discount on invoiced amount of products                 10.00%        
Molds and tools                          
Significant Accounting Policies [Line Items]                          
Property and equipment useful life                 3 years        
Impairment charges                 $ 0 $ 0 $ 0    
4.25% Convertible Senior Notes (due 2018)                          
Significant Accounting Policies [Line Items]                          
Long term debt, face amount       $ 100,000,000       $ 22,469,000 $ 22,469,000        
Debt instrument, interest rate       4.25%       4.25% 4.25% 4.25%      
Debt instrument, maturity date       Aug. 01, 2018         Nov. 01, 2020        
Conversion rate in share per $1000 principal amount of notes       114.3674                  
Convertible senior note payable, fair value               $ 20,500,000 $ 20,500,000 $ 18,900,000      
Debt instrument, maturity year                 2018 2018      
Frequency of interest payment                 Semi-annually        
Debt instrument, conversion rate       $ 8.74                  
Debt instrument repurchase amount   $ 12,000,000       $ 12,000,000 $ 39,100,000 51,100,000 $ 51,100,000 $ 6,100,000      
Payment for repurchase of convertible notes           11,600,000 24,100,000   $ 35,600,000        
4.25% Convertible Senior Notes (due 2018) | Common Stock                          
Significant Accounting Policies [Line Items]                          
Debt instrument repurchase amount   $ 11,600,000       $ 11,600,000 $ 39,100,000            
Debt instrument shares common stock issued upon conversion   112,400       112,400 2,865,000   3,000,000        
4.875% Convertible Senior Notes (due 2020)                          
Significant Accounting Policies [Line Items]                          
Long term debt, face amount     $ 115,000,000         $ 113,000,000 $ 113,000,000 $ 113,000,000      
Debt instrument, interest rate     4.875%         4.875% 4.875% 4.875%      
Debt instrument, maturity date     Jun. 01, 2020                    
Conversion rate in share per $1000 principal amount of notes     103.7613                    
Convertible senior note payable, fair value               $ 89,700,000 $ 89,700,000 $ 89,300,000      
Debt instrument, maturity year                 2020 2020      
Frequency of interest payment               semi-annually Semi-annually        
Debt instrument, conversion rate     $ 9.64                    
Debt instrument repurchase amount                       $ 2,000,000  
Net proceeds from debt instrument     $ 110,400,000                    
3.25% Convertible Senior Notes (due 2020)                          
Significant Accounting Policies [Line Items]                          
Long term debt, face amount               $ 21,178,000 $ 21,178,000 $ 93,865,000      
Debt instrument, interest rate               3.25% 3.25% 3.25%      
Debt instrument, maturity year                 2020 2020      
Debt instrument, conversion rate               $ 3.05 $ 3.05        
3.25% Convertible Senior Notes (due 2020) | Oasis Management and Oasis Investments ll Master Fund Ltd.                          
Significant Accounting Policies [Line Items]                          
Long term debt, face amount $ 21,500,000                        
Debt instrument, interest rate 3.25%                        
Debt instrument, maturity date Nov. 01, 2020                        
Conversion rate in share per $1000 principal amount of notes 328.0302                        
Convertible senior note payable, fair value               $ 22,500,000 $ 22,500,000        
After Modification Senior Notes (due 2018) | Oasis Management and Oasis Investments ll Master Fund Ltd.                          
Significant Accounting Policies [Line Items]                          
Long term debt, face amount $ 21,500,000                        
Debt instrument, interest rate 3.25%                        
Debt instrument, maturity date Nov. 01, 2020                        
Conversion rate in share per $1000 principal amount of notes 328.0302                        
China Joint Venture                          
Significant Accounting Policies [Line Items]                          
Percentage of ownership interest in joint venture               51.00% 51.00%        
DreamPlay Toys                          
Significant Accounting Policies [Line Items]                          
Percentage of ownership interest in joint venture                         50.00%
DreamPlay Toys | Technology Rights                          
Significant Accounting Policies [Line Items]                          
Impairment charge                 $ 2,900,000