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Stockholders' Equity - Summary of Nonvested Shares (Detail) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares Underlying RSUs      
Nonvested beginning balance (shares) 931,000    
Granted (shares) 292,000    
Vested and released (shares) (442,524)    
Forfeited (shares) (84,000)    
Nonvested ending balance (shares) 696,000 931,000  
Nonvested, beginning balance (usd per share) $ 129.42    
Granted (usd per share) 255.42 $ 262.58 $ 118.77
Vested and released (usd per share) 105.83    
Forfeited (usd per share) 184.04    
Nonvested, ending balance (usd per share) $ 190.60 $ 129.42  
Weighted Remaining Vesting Period (in years)      
Unvested as of December 31, 2019 1 year 1 month 6 days    
Aggregate Intrinsic Value      
Unvested as of December 31, 2019 $ 194,114