Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
shares
vote
director
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
shares
vote
director
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
shares
May. 14, 2015
shares
Jan. 01, 2015
shares
Dec. 31, 2014
shares
May. 09, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock based compensation expense | $ $ 5,011 $ 4,002 $ 13,524 $ 11,080        
Percentage of fair value market of common stock     100.00%          
Vesting period for new restricted stock units     4 years          
Term of option granted, minimum     7 years          
Term of option granted, maximum     10 years          
Shares issued upon settlement of bonus awards (shares)         200,000     600,000
Common stock, shares authorized (shares) 550,000,000   550,000,000       550,000,000  
Class A Common Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, shares authorized (shares) 500,000,000   500,000,000       500,000,000  
Voting rights per share | vote 1   1          
Number of convertible common stock 1   1          
Class B Common Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, shares authorized (shares) 500,000,000   500,000,000       500,000,000  
Voting rights per share | vote 10   10          
Number of directors appointed by shareholders | director 2   2          
Equity Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized for issuance (shares)           1,500,000    
Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized for issuance (shares)           500,000    
Contribution of earnings by employees 15.00%   15.00%          
Percentage of purchase of common stock     85.00%          
Percentage of common stock on the date of purchase     85.00%          
RSU and RSA [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted-average grant date fair value (usd per share) | $ / shares     $ 10.14 $ 9.04        
RSUs [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock based compensation expense | $ $ 3,200              
RSUs granted in period (shares)     1,100,000 700,000        
Aggregate fair value of RSUs granted | $     $ 11,200 $ 6,400        
Period for expensing stock-based compensation     4 years 4 years        
RSUs [Member] | Entropic Communications [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock based compensation expense | $ $ 800   $ 3,200          
Stock Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Option Granted in period | $ / shares     $ 0          
Options granted in period (shares)       400,000        
Aggregate fair value of options granted | $       $ 1,700