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Employee Benefits and Share-Based Compensation - Summary of Share Option Activity (Details) - 2009 Plan - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Number of Shares      
Outstanding at beginning of period (in shares)   3,932,000  
Granted (in shares) 0 150,000  
Exercised (in shares)   (648,000)  
Expired (in shares)   (11,000)  
Forfeited (in shares)   (180,000)  
Outstanding at end of period (in shares) 3,243,000 3,243,000 3,932,000
Exercisable at end of period (in shares) 1,640,000 1,640,000  
Vested and expected to vest at end of period (in shares) 3,104,000 3,104,000  
Weighted-Average Exercise Price      
Outstanding at beginning of period (in dollars per share)   $ 62.50  
Granted (in dollars per share)   125.80  
Exercised (in dollars per share)   55.70  
Expired (in dollars per share)   60.64  
Forfeited (in dollars per share)   74.79  
Outstanding at end of period (in dollars per share) $ 66.11 66.11 $ 62.50
Exercisable at end of period (in dollars per share) 51.96 51.96  
Vested and expected to vest at end of period (in dollars per share) $ 65.35 $ 65.35  
Weighted-Average Remaining Years      
Outstanding   7 years 1 month 6 days 7 years 9 months 18 days
Exercisable   5 years 9 months 18 days  
Vested and expected to vest   7 years  
Aggregate Intrinsic Value      
Outstanding $ 266,946 $ 266,946 $ 226,160
Exercisable 158,170 158,170  
Vested and expected to vest $ 257,873 $ 257,873