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Share-Based Compensation - Information for Restricted Stock Units under Equity Incentive Plan (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Feb. 01, 2019
Weighted Average Grant Date Fair Value      
Market price (usd per share) $ 224.59 $ 224.59  
Restricted stock units and awards      
Shares      
Nonvested, beginning of period, in shares   597,296  
Granted, in shares   526,639  
Vested, in shares   (212,179)  
Forfeited, in shares   (43,377)  
Nonvested, end of period, in shares 868,379 868,379  
Weighted Average Grant Date Fair Value      
Nonvested, beginning of period, in usd per share   $ 194.48  
Granted, in usd per share   244.61  
Vested, in usd per share   150.20  
Forfeited, in usd per share   179.28  
Nonvested, end of period, in usd per share $ 236.46 $ 236.46  
Restricted stock units and awards | Retention Plan for SVB Leerink      
Shares      
Granted, in shares 125,160    
Weighted Average Grant Date Fair Value      
Market price (usd per share)     $ 238.28
Award vesting period   5 years