Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
director
vote
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Aug. 12, 2016
shares
May 13, 2016
shares
Aug. 20, 2015
shares
May 14, 2015
shares
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]              
Common stock, shares authorized (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 | $ $ 700            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 10 months 25 days            
Stock based compensation expense | $ $ 21,765 $ 19,268 $ 15,008        
Shares issued upon settlement of bonus awards (shares)       200,000 200,000 300,000 200,000
Deferred Compensation Share-based Arrangements, Liability, Current | $ 3,800            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $ $ 6,500 $ 6,600 $ 600        
Class A Common Stock [Member]              
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]              
Common stock, shares authorized (shares) 500,000,000 500,000,000          
Voting rights per share | vote 1            
Class B Common Stock [Member]              
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]              
Common stock, shares authorized (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 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 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 30 days            
Portion of equity awards that have not been vested or earned | $ $ 44,100            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 18.83            
RSUs granted in period (shares) 2,932,000            
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 2 years 8 months 24 days            
Option Granted in period | $ / shares $ 0            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0