Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail)

v3.3.1.900
Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
shares
Dec. 31, 2015
vote
Dec. 31, 2015
director
Aug. 20, 2015
shares
May. 14, 2015
shares
May. 09, 2014
shares
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                      
Common stock, shares authorized (shares) | shares     550,000,000     550,000,000          
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options         $ 1,600            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term   1 year 5 months 2 days                  
Issuance of Stock and Warrants for Services or Claims   $ 700 $ 100 $ 200              
Stock based compensation expense   $ 19,268 15,008 12,686              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding         53,600            
Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Intrinsic Value     21,900 14,900 31,400            
Shares issued upon settlement of bonus awards (shares) | shares                 300,000 200,000 600,000
Deferred Compensation Share-based Arrangements, Liability, Current         4,100            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value     $ 600 $ 300 6,600            
Class A Common Stock [Member]                      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                      
Common stock, shares authorized (shares) | shares     500,000,000     500,000,000          
Voting rights per share           1 1        
Class B Common Stock [Member]                      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                      
Common stock, shares authorized (shares) | shares     500,000,000     500,000,000          
Voting rights per share | vote             10        
Number of directors appointed by shareholders | director               2      
Equity Incentive Plan [Member]                      
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Vesting period for new restricted stock units   4 years                  
Term of option granted, minimum   7 years                  
Term of option granted, maximum   10 years                  
Common Stock Capital Shares Reserved For Future Issuance Period Increase Decrease | shares   2,600,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum   4.00%                  
Employee Stock Purchase Plan [Member]                      
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Contribution of earnings by employees   15.00%                  
Percentage of purchase of common stock   85.00%                  
Percentage of common stock on the date of purchase   85.00%                  
Common Stock Capital Shares Reserved For Future Issuance Period Increase Decrease | shares   1,000,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum   1.25%                  
MaximumDurationOfEmployeeStockPurchasePlan   27 months                  
RSU and RSA [Member]                      
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term   2 years 7 months 2 days                  
Portion of equity awards that have not been vested or earned         $ 26,600            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares   $ 10.41                  
RSUs granted in period (shares) | shares   2,963,000                  
RSUs [Member] | Entropic Communications [Member]                      
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Stock based compensation expense $ 3,400                    
Stock Option [Member]                      
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term   3 years 7 months 21 days                  
Option Granted in period | $ / shares   $ 0                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares   0                  
Stock Option [Member] | Entropic Communications [Member]                      
Stock Issued or Granted During Period, Share-based Compensation [Abstract]                      
Stock based compensation expense   $ 200