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Stock-Based Compensation Expense - Additional Information (Detail)
12 Months Ended
May. 14, 2015
USD ($)
shares
May. 22, 2014
USD ($)
shares
May. 09, 2013
USD ($)
shares
Dec. 31, 2015
USD ($)
Installment
$ / shares
shares
Dec. 31, 2014
USD ($)
Installment
$ / shares
shares
Dec. 31, 2013
USD ($)
Dec. 31, 2011
USD ($)
shares
Sep. 16, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period       4 years        
Maximum contractual term       10 years        
Stock-based compensation expense | $       $ 21,033,000 $ 17,638,000 $ 10,804,000    
Tax benefits related to non-cash stock-based compensation awards | $       8,400,000 $ 7,100,000 $ 4,100,000    
Unrecognized compensation expense | $       $ 5,900,000        
Weighted average remaining life for recognition of unrecognized compensation expense       2 years 5 months 23 days        
Non Employee Directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grant date fair value | $ $ 600,000 $ 600,000 $ 600,000          
President and Chief Executive Officer | Corporate Expenses                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accelerated stock compensation costs | $       $ 8,700,000        
Equity Incentive Plan 2011                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of vesting stock based compensation, second anniversary               30.00%
Percentage of vesting stock based compensation, fourth anniversary               20.00%
Total awards of shares under equity incentive plan             35,000,000  
Options outstanding       25,313,400        
Options outstanding, unvested       5,806,580        
Options outstanding, vested       19,506,820        
Equity Incentive Plan 2011 | First and second anniversaries                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage       30.00% 30.00%      
Equity Incentive Plan 2011 | Third and fourth anniversaries                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage       20.00% 20.00%      
Equity Incentive Plan 2011 | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options outstanding exercise price | $ / shares       $ 0.48        
Equity Incentive Plan 2011 | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options outstanding exercise price | $ / shares       $ 6.46        
Equity Incentive Plan 2008                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options outstanding       407,438        
Options outstanding exercise price range, lower limit | $ / shares       $ 2.54        
Options outstanding exercise price range, upper limit | $ / shares       $ 3.30        
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares of restricted Class A common stock       4,700,000.0 800,000.0      
Grant date fair value | $       $ 2,200,000 $ 3,200,000      
Exercise price | $ / shares       $ 2.47        
Shares of restricted Class A common stock       242,916        
Total fair value of restricted stock awards vested | $       $ 600,000 $ 600,000      
Restricted Stock | Officers and Members of the Board                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of annual award vesting installments | Installment       4 4      
Percentage of vesting stock based compensation, second anniversary       50.00%        
Restricted Stock | First and second anniversaries | Officers and Members of the Board                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of annual award vesting installments | Installment       2 2      
Restricted Stock | Third and fourth anniversaries | Officers and Members of the Board                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of annual award vesting installments | Installment       2 2      
Restricted Stock | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price | $ / shares       $ 0.48 $ 3.5      
Restricted Stock | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price | $ / shares       $ 4.34 $ 7.74      
Restricted Class Common Stock | Non Employee Directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period 1 year 1 year 1 year          
Shares of restricted Class A common stock 242,916 93,312 168,540          
Equity Incentive Plans                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock that remain authorized, reserved and available for issuance, not including shares underlying outstanding grants       3,300,000        
Incentive Stock Options | Equity Incentive Plan 2011                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares of Class A common stock issued or transferred upon exercise of incentive stock options             17,500,000  
Restricted stock, Restricted Stock Units, Performance Shares, Performance Units and Other Awards | Equity Incentive Plan 2011                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares of Class A common stock issued as restricted stock, RSUs, performance shares, performance units and other awards             12,000,000  
Stock Appreciation Rights and Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Earliest vesting period after grant date except in the event of retirement death or disability       3 years        
Earliest vesting period after grant date if management objectives are achieved       1 year        
Stock Appreciation Rights and Stock Options | Equity Incentive Plan 2011                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grant date fair value of stock options or SAR's available for grant to a participant             11,500,000  
Performance Based Compensation | Equity Incentive Plan 2011                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Grant date fair value of stock options or SAR's available for grant to a participant             3,000,000  
Grant date fair value of stock options or SAR's available for grant to a participant | $             $ 5,000,000  
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Earliest vesting period after grant date except in the event of retirement death or disability       3 years        
Earliest vesting period after grant date if management objectives are achieved       1 year