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Share Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2016
Apr. 30, 2014
Mar. 31, 2016
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 29, 2015
Sep. 30, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock option awards granted         380,000 745,000 600,000      
Options outstanding, shares         1,323,000 1,201,000 600,000     16,000
Expected dividend yield         0.00% 0.00% 0.00%      
Stock options vested         283,750 150,000 0      
Aggregate fair value of stock option vested         $ 14,200,000 $ 6,300,000        
Weighted average grant date fair value of stock option awards         $ 73.86 $ 55.84 $ 42.03      
Unrecognized share-based compensation expense         $ 47,800,000          
Unrecognized compensation expense expected to be recognized         2 years 8 months 12 days          
Increase in equity         $ 1,100,000   $ 23,600,000      
Tax benefit realized from exercise of stock options           $ 0        
Subsequent Event                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of unvested stock options, forfeited 200,000                  
Unvested stock options subsequently forfeited in January 2016                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized share-based compensation expense         $ 6,800,000          
Unrecognized compensation expense expected to be recognized         1 year 7 months 6 days          
Scenario, Forecast                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Reversal of share-based compensation expense     $ 1,600,000              
Angel.Com                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Cash payment for termination of incentive plan       $ 8,000,000            
2013 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense recognized         $ 17,300,000 11,800,000 2,100,000      
2013 Plan | Class A                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation, stock authorized   1,500,000           1,700,000 600,000  
Share-based compensation award expiration period         10 years          
Stock option awards, vesting period         4 years          
2013 Plan | Class A | Non Employee Directors                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of automatic annual stock option grants authorized to each of the Company's non-employee directors beginning in May 2015   5,000                
2013 Plan | Class A | Employees, Officers, and Directors                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock option awards granted         380,000          
Options outstanding, shares         1,322,750          
Remaining shares of class A common stock authorized for future issuance         277,500          
Other Stock Incentive Plans                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense recognized         $ 0 $ 0 $ 0